Jacen Solo is the eldest son of Han Solo and Leia Organa Solo and the twin to Jaina Solo. Some other bio info here to fill in the blank.

At this point, this thread will just cover the one topic, the second half from the previous part:

• Lightsaber and Combat Feats

Lightsaber and Combat Feats

Jacen and the members of the Myrkr strike team are now close to the voxyn queen and had to get through a grashal, a type of Yuuzhan Vong organic building, and its thorn hedge defense. The Jedi would fight their way through the grashal, dealing with deadly thorns and an overwhelming amount of Yuuzhan Vong warriors before Anakin Solo would have a moment of Oneness and sacrifice himself to destroy the genetic material for the voxyn that Nom Anor was trying to smuggle away:

Spurred into action, the strike team readied their weapons and opened their emotions. Despite the lingering outrage—and some feelings of blame—over the Dark Jedi's betrayal, the battle meld felt the tightest it had been since the detention warrens. Anakin knelt a few meters from the passage mouth and took aim at one of the dark shapes visible through the thorn hedge. When he felt the others also find their targets—two to each guard—he fired.

Eight streaks of color fanned down the dusty slope and tore through the hedge into the four dark shapes beyond. None of the bolts missed. No Jedi would bungle such an important attack, not with the Force to guide his aim. But only two shots burned through. Six ricocheted off the guards' vonduun crab armor, blasting dust columns into the air or burning pits into the grashal wall.

The surviving guards dropped and crawled for cover. Half the strike team was already rushing down the slope, firing as they ran, their T-21 repeating blasters keeping the Yuuzhan Vong pinned and clearing the hedge for the more powerful weapons behind.

Anakin and Jaina fired again. Prone to deflection and straying at that distance, their power blasters could only flush the guards. One warrior fell to Alema's longblaster. The other was staggered by Tesar's minicannon, then finished by the T-21s as they reached effective range. Now the second wave was up and running. Despite the strength Tesar was sharing, Anakin could not keep pace. Tahiri, Jaina, and Tesar dropped back to stay with him.

"Go! I'll catch up."

"When Jawas swim!" Tahiri shot back.

"Anakin, you're in no condition," Jaina said. "Go back to the equipment pit and locate Lowie. Maybe if you find a safe place to hole up and go into a healing trance—"

"Too late for that," Anakin said. "I'm seeing this through."

"Even if it means putting others at risk?" Jaina demanded. "If you're slow, you're a danger to us all. At least try a trance."

Things had gone too far for a trance, Anakin knew. He was thirsty enough to drink sweat, and his abdomen was hard with trapped blood, and the effort of finding a place safe enough to enter a trance would probably kill him anyway. But the thought that he might be endangering others did give him pause. It was one thing to face the inevitable, quite another to take others along. He sought guidance from the Force, opening himself to its tide, trying to sense where it was carrying him.

The sound of the ruffling voxyn scales rose to mind. He felt again the awe he had experienced in the arena, when he realized it had been Yuuzhan Vong patricians who fought there. The Force had spoken to him then.

"I'm going," he said.

Jaina clenched her jaw, then looked away. "I thought so."

The first wave reached the hedge and ducked through the burn holes. Stalks began to strike like snakes. Half a dozen lightsabers snapped to life and hacked the brambles away, then the Jedi stumbled out the other side ripping thorn tangles from around their throats and legs. The hedge struck again as the second wave crossed. The first wave left them to their own devices and continued on toward the grashal. Speed was crucial. During their reconnaissance, Anakin had sensed a company of Yuuzhan Vong lurking a few hundred meters beyond the cloning lab, presumably where the strike team had been expected to leave the voxyn warrens.

By the time Anakin and his three companions penetrated the hedge, the first wave had already cut through the grashal wall. Tenel Ka, Zekk, and Alema pressed themselves against the block and rode along as Ganner used the Force to shove the monolith inside.

A burring cloud of bugs came boiling out. The Jedi huddled down in their armored jumpsuits, their blades tracing crackling color fans as they batted insects from the air. A grenade explosion rocked the grashal, then another and another, and the bug storm withered to a trickle.

"Clear!" Zekk yelled.

Ganner and Jacen ducked inside. Jaina hefted her power blaster to follow, but then everyone's comlinks popped and hissed static. There came a ripple in the Force, maybe strong enough to be Raynar's death. Anakin looked to the ceiling, saw nothing through the patching membranes but Myrkr's green glow. He would never know.

"They'll pay." Jaina tore her eyes from the ceiling. "They will pay."

"Then so will we," Anakin said. Jaina's eyes were sunken with fatigue and her mouth was drooping with sorrow, and she looked more frail and troubled than Anakin had ever seen her. "We're here to destroy the queen, not take revenge."

"Right." Jaina stepped through the opening. "Revenge comes later."

Anakin left Tahiri and Tekli at the breach with Alema's longblaster and followed his sister into the grashal. It was like stepping into a Yavin 4 nightstorm, a dark fog hanging overhead, glow lichen up there somewhere casting sallow halos, blaster bolts and lightsabers flashing like colored lightning—and the humid air muffling the scream and roar of combat, making all that death seem more distant than it was.

Anakin spun out from behind the door block and batted a razor bug from the air, found himself staring through a jungle of pulsing white vines, their corkscrew stalks rising out of planting bins filled with briny-smelling mud. The Yuuzhan Vong were ahead everywhere, their presence too dispersed and indistinct to tell him much. A pair of thud bugs sent him diving for cover. He exchanged his lightsaber for the power blaster and came up firing.

The first shots left him so light-dazzled he glimpsed only a dark shape on the opposite side of the bin, diving for cover. He spun around the end of the box, heard the snap-hiss of an igniting lightsaber, then Tesar Sebatyne's familiar hissing. The Yuuzhan Vong had thrown his last bug.

Anakin reached out with the Force and found the rest of the strike team taking heavy swarm, pinned down in the darkness. Easy enough to fix. He reached for his incendiary grenades, but felt Tesar already lifting three objects into the dark fog overhead.

A smug Yuuzhan Vong presence drew Anakin's attention to the next planting bin. Rolling from his hiding place, he saw a dark figure leaping across the aisle ahead, amphistaff poised to strike. He lifted his power blaster . . . and pitched forward as a razor bug sliced across his neck from behind, vibro-sharp mandibles gliding off his jumpsuit's armored lining. The insect banked and came back, pincers stretching for his face. Anakin pivoted and took a cheek slash, fired at his original target.

The bolt caught the Yuuzhan Vong in a shoulder seam and spun him around. An arm flew off trailing the smell of scorched flesh, but the warrior did not even scream. He just pirouetted and, now swinging one-armed, brought his amphistaff down.

Anakin's razor bug came around again, this time slashing for the throat, and he had to turn away. Behind him, Tesar's lightsaber snapped to life and sputtered harshly. Anakin blocked with the body of the power blaster, then took a pair of thud bugs in the flank and slammed to the floor. He heard the dull thump of an amphistaff hitting a thick reptilian skull, and the flow of strength trailed off as the Barabel plummeted into insensibility.

Anakin did not consciously fire his power blaster. He was too busy reaching up into the darkness, searching for falling grenades. How many seconds left? The power blaster just flashed, and Tesar's attacker crashed to the floor.

Anakin found what he was looking for and pushed. A ripple of danger sense made him roll away as the razor bug crashed to the floor where his head had been. He hammered the thing dead, then heard the telltale crackle of the grenade detonations. Hoping he would still be there when the sound fell silent, he closed his eyes and reached out to find his attacker through the lambent crystal.

Not easy—too many Yuuzhan Vong in too many places—but he felt something off to his left. He spun and fired.

The depletion alarm sounded, just loud enough to be heard over the crackling flames above. The Yuuzhan Vong presence was closer now, eager. Flinging the useless blaster aside, he plucked his lightsaber from his belt and thumbed it to life, brought it into a cross-body guard—caught an amphistaff descending toward his head. Eyes still squeezed shut against the brilliant glare above, he swung his legs around and scissored his attacker's knees. The contest ended in a quick lightsaber thrust.

The flames crackled out. Anakin opened his eyes and saw yellow glow lichen shining bright, the last wisps of vapor cloud evaporating into the hot air. He lay there for a long time, taking stock of his condition, trying to fight off his anguish. It took five full breaths to establish that the pain was caused only by his old wound, ten heartbeats more to bring it under control.

Gradually, Anakin grew aware of the battle meld again, of the strike team's mounting elation. Pushing his agony aside, calling on the Force, he lifted himself to his feet. The Jedi were advancing on the left side of the grashal, driving back the last handful of shapers and guards, slashing nutrient vines and cloning pods as they went. Through the pulsing tangle of stalks, he could not see what they were hunting—but he could feel it, over by the grashal wall, trapped a little below floor level, unsettled, wild, ferocious. Afraid.

Behind Anakin, the longblaster boomed. He felt panic from Tahiri and turned to find her rushing into the grashal. A ball of fire followed her through the breach and exploded into the monolith standing there, and Tahiri went flying.

Anakin rushed to help, but she was up before he took two steps. "Magma spitters! We're cut off."

Anakin did not bother to look. "Tekli?"

Tahiri pointed behind him, where the Chadra-Fan was sprinkling stinksalts on Tesar's forked tongue. The Barabel was smiling, but not waking.

"Take him . . . and go." Every word filled Anakin's belly with fire. He pointed toward the others. "You may need to cut a way out."

"'You'?" Tahiri said. "I'm not going—"

"Do it!" Anakin snapped. When Tahiri's face fell, he spoke more gently. "You need . . . to help Tekli. I'll be along."

"Yes, Tahiri," Tekli said. She cast a knowing glance at Anakin, then kneeled astride the Barabel and began to slap him. "Tesar is not responding. I cannot move him and work on him both."

Tahiri looked doubtful, but could hardly refuse to help. Blinking back a tear, she stretched up to kiss Anakin on the lips—then caught herself and shook her head. "No—for that, you have to come back."

Anakin gave her his best lopsided smile. "Soon, then."

"Soon," Tahiri repeated. "May the Force be with you."

This second part, she added so quietly that Anakin did not think she meant him to hear it. All too aware of the growing weakness in his legs, he went to the makeshift doorway and peered around the edge. An artillery squad had set up beyond the thorn hedge, their four magma spitters trained on the opening. No one was attempting to move closer, which meant the main force would be attacking from the other side. Anakin turned toward the primary entrance and focused on what he felt through the lambent crystal. It did not surprise him at all to sense a heavy Yuuzhan Vong presence streaming in from the ambush site.

He set off at a painfully slow run. Twice, he dropped to a knee when his legs buckled—once while trading blows with a glassy-eyed Yuuzhan Vong who had no more business in hand-to-hand combat than he did. He won that fight by slashing open a planting bin, then levitating himself while the nutrient mud spilled out and swept his foe off balance. The next combat he nearly did not survive at all, catching an amphistaff butt in his wound and popping the external stitches. His life was saved only when he used the Force to bounce his blaster off the warrior's tattooed brow.

As he retrieved his weapon and rose, Anakin vomited blood. Even before he was finished, he was using the Force to lift himself to his feet, willing himself to run. He had to beat the enemy assault force to the door. At last, he cleared the planting bins and spied the door membrane twenty meters to his left, as wide as an X-wing was long and twice as high. The far corner of the membrane rose slightly. Anakin ducked back into the planting beds, free hand already pulling a thermal detonator from his harness.

When Anakin saw the figure who stepped through, he nearly dropped the detonator. The newcomer's back was turned, but he wore a tattered jumpsuit and stood a head taller than most humans. He set off for the voxyn pen at a sprint.

"Lowie?" Anakin called, using the Force to make his weak voice carry.

He reached out, but felt only the same hazy Yuuzhan Vong presence as before. The newcomer turned, revealing the profile of a sandy-haired human, and raised an old E-11 blaster rifle.

Anakin was already behind a planting bin, activating his com-link. "Impostor!" he warned. "Trying for pens."

The blasterfire crescendoed to a deafening roar, as did the Jedi frustration. The firing angles were impossible. A grenade detonated somewhere, and Jaina yelled for a charge.

The door membrane began to roll upward, revealing forty pairs of Yuuzhan Vong feet waiting to rush inside. Anakin opened himself to the Force completely, drawing it into himself through the power of his emotions—not through his anger or fear like a Dark Jedi, but through his love for his family and his fellow Jedi Knights, through his faith in the Jedi purpose and the promise of the future. The Force poured in from all sides, filling him with a swirling maelstrom of power and purpose, saturating him and devouring him. There was nothing to be frightened of, no reason to grieve. He could feel it flowing into him and himself flowing into it. Anakin was the Force, and the Force was Anakin.

Anakin rose. His body emitted a faint aura of light—the glow of his cells burning out—and the air crackled around him. His injuries no longer pained him. He was acutely aware of everything in the grashal—the musty smell of the droning thud bugs, the sultry heat rising from the planting bins, the huffing breath of his fellow Jedi, even the Yuuzhan Vong. Their presence was as distinct to him as that of his own companions, almost as though the Force had somehow expanded to include them.

Firing as he ran, Anakin raced along the rising door. Every bolt blasted a Yuuzhan Vong foot. Muffled roars reverberated through the membrane. Ahead of him, half a dozen warriors dropped and rolled into the grashal. He blasted these before they could rise, then reached the other end and stroked the tickle pad. The door lowered again.

"Hutt breath!" Jaina cursed over the comlink. "She's escaping."

Anakin could feel it, too. The voxyn was moving down and away. He activated his own comlink. "The impostor must have opened an escape tunnel." It no longer hurt to speak, but his aura had gone from faint to bright. His cells were burning like fire. "Jacen, you're in charge. Take everyone and go after her."

Jaina's surprise at not having her own name called carried through the Force like a shout across water, but she stifled any resentment she felt and said, "Can't get there, Little Brother."

"The path will clear."

Anakin slashed the membrane tickle pad and circled toward the empty voxyn pen. He could feel Yuuzhan Vong ahead, crouching behind the last row of planting bins, secure in the knowledge that help was coming. That changed a moment later, when Anakin began to pour blasterfire into their flank. His angle was poor for head shots and his bolts too weak to penetrate vonduun crab armor, but by the time the Yuuzhan Vong realized that, they were being overrun by Jedi.

[...]

The longblaster roared from the pen area, blowing a head-sized hole through one Yuuzhan Vong and a fist-sized hole through the one behind him. Anakin launched himself into a back flip and landed five meters away. His aura flickered wildly as his cells began to burn and burst. He hazarded a glance over his shoulder and saw Jaina peering over the pit wall, tears streaming down her cheeks, the longblaster propped against her shoulder. Jacen was beside her, likewise weeping, trying to pull her away.

Go! Anakin said through the Force. I can't hold.

The Yuuzhan Vong charged again, and Jaina fired. Another warrior fell, and the rest came. Anakin flipped another five meters back—then felt someone, a Yuuzhan Vong, creeping along the far wall of the grashal. He retreated until he could see the figure: the Jedi impostor, perhaps thirty meters distant, dragging a heavy cargo pod toward the strike team's makeshift opening.

The warriors arrived again, and Anakin had to defend himself. Purple blade ticking back and forth, blocking and parrying and slipping strike after strike, he faded two steps and saw an opening. He brought his feet up and planted his heels in the center Yuuzhan Vong's chest. His lightsaber flashed twice, cleaving the skulls of the adjacent warriors, then he kicked off, launching himself into a series of Force-assisted cartwheels.

Anakin continued far enough to see where the impostor had come from, a work area near the queen's pen. Dozens of tendrils lay stretched along a workbench, each ending in a small cloning pod, some open, some closed. It looked like a tissue transfer station.

That was what the impostor had, a cargo pod full of voxyn tissue, enough to clone a million. Anakin's aura flashed and dimmed, flashed again and dimmed more, his cells rupturing in chain reactions, the cycles coming faster and faster as less of him remained to contain the energy. He felt himself not exactly departing, but melting back into the Force. He pulled his last thermal detonator off his harness and thumbed the timer three clicks.

Go now.

"Anakin, I can't!" Jaina commed.

Anakin raised the detonator so his brother and sister could see. Thirty seconds. He released the trigger. Take her, Jacen. Kiss Tahiri for me.

With the charging warriors almost on him again, Anakin threw the detonator across the grashal. He wasn't conscious of using the Force to guide it, but he must have, because it hit the impostor in the head.

[...]

Nom Anor rushed for the detonator again. Anakin waited, waited until the executor was almost on it, then reached out with the Force one last time, rolling the sphere toward the cargo pod.

He did not hear the angry curse that followed, nor did he see Nom Anor fleeing at a dead run.

By then, Anakin was gone.

Source: The New Jedi Order - Star by Star

By this point, the strike team had destroyed one assault company and cut up two others:

Frigates of this size were known to carry only three assault companies, and by his count, they had already destroyed one and cut up the other two pretty badly.

Source: The New Jedi Order - Star by Star

Jacen engages and kills the queen voxyn. The queen hadn't been trained to hunt and kill Jedi but rather to prioritize her own survival, but this still proved challenging as Jacen had to deal with toxic fumes after losing his breath mask:

The voxyn pulled away fast, the shaper less so. Jacen reached out with the Force, this time to soothe the voxyn. Not a chance. With plasma balls bursting and lasers flashing just a few hundred meters away, the queen continued to run. He tried to call her hunting instincts into play. No good either. Where her clones were trained to stalk Jedi, she was trained only to preserve her own life. Jacen pulled one of two thermal detonators from his belt, thumbed the fuse to the first click, and used the Force to hurl it into her path.

The queen whirled away from the silver ball, found her handler in the way, and slapped him aside. Jacen saw an arm fly in one direction and the rest of the shaper tumble in another, then the voxyn was racing toward him, head rising to belch acid. He activated his lightsaber and charged to meet her.

She disgorged her acid at three paces. Jacen launched into an airborne round-off, and the brown spray shot past below. Then the detonator crackled behind him, and he found himself swinging at empty air. He landed lightly and sprang into a half twist that brought him around facing the same direction as before, and his heart rose into his throat. No voxyn, only the brilliant flash of the detonator shrinking in on itself. Blinded, Jacen brought his lightsaber around in a block-and-slash and reached out to locate his quarry.

She was off to the side, moving away slowly. He blinked the dazzle from his eyes and found her crawling out onto the basal-comb, angling away from the battle, angling away from Jacen, her body so broad she had to straddle the wall between the cells. He left his T-21 slung on his shoulder and started after her. He had only a handful of shots remaining, and the bolts would not penetrate her thick scales anyway.

[...]

"Check. You hurry." Jacen reached the basal-comb and had to slow. The walls between cells were a half meter wide, but so steeply crowned that running over them was like running on a board's edge. "Shuttle first."

"Us?" Zekk complained. "You do know the Yuuzhan Vong are chasing you?"

Jacen had no time to look. He was gaining on the queen. "Shuttle first," he repeated. "I have to finish here."

The voxyn stopped at the next cell convergence, where the walls met to form a sort of island, then whirled. Jacen leapt across the dovin basal and landed at her rear flank, tottering and activating his lightsaber. The voxyn screeched, but could not bring her head around far enough to assault Jacen. He danced forward and brought his blade down behind her forward leg.

Internal organs began to slip from the gap, leaking blood into the air and filling it with toxic fumes. Jacen slashed sideways, taking the second leg off at the joint, then thrust deep and brought the blade up. The voxyn pulled away, retreating onto the adjacent wall so she could turn on him. He leapt across to stay behind her—then heard a razor bug droning in his direction.

Jacen dropped into a squat and brought his weapon up to block, and the bug crackled out of existence. The voxyn continued to retreat until she could face him again. Jacen launched himself into a back flip and came down on the cramped convergence behind him, dared to glance away from the queen.

The stolen frigate was already sweeping across the basin toward the crashed shuttle, the forward ramp hanging open for quick boarding. Nom Anor and his warriors were within a hundred meters now, some staring up at the stolen frigate with gaping jaws, others still crawling toward Jacen, but all too distant to have thrown the razor bug.

A shiver of danger sense drew Jacen's attention in the opposite direction. He turned and saw a large Yuuzhan Vong flying at him across the cell.

"No, Jeedai!" The figure extended a single arm.

Jacen swept his lightsaber up and cut the fellow through at the waist and did not even recognize him as the shaper until an eight-fingered hand caught hold of his breath mask and nearly jerked him over. He lowered his head, and the breath mask came off. The Yuuzhan Vong's torso tumbled into the cell beside him, angry eyes glaring up, and barely touched the dovin basal before the creature reacted with its only defense. A tiny gravitic singularity sprang into existence, then the shaper's corpse collapsed in on itself and disappeared in a flash of dancing color.

The acrid smell of toxic blood reminded Jacen of the peril he faced without a breath mask. He looked up to find the queen staring at him from two meters away, eyes expressionless and black, the Force heavy with her grim resolve. The creature knew why he was here. She was not angry, not hateful—only determined to save herself. Jacen did not want to kill her—he had never wanted to kill any animal. Perhaps she sensed that in him.

Jacen's head started to spin. He had to finish this. Flicking his lightsaber to hold the creature's attention, he dropped his free hand toward his last thermal detonator. The queen came bounding. He pulled the detonator off his harness. She stretched forward to snap at his head, then surprised him with a claw to the shoulder.

The talons bit deep, launched him off his perch. The detonator flew, inactivated, from his hand, and the dovin basal appeared beneath him, rising fast. He whipped his legs over his head, flinging himself to the opposite side of the cell. Landing dizzy and off balance, Jacen continued in the same direction, this time flipping higher to buy more time.

He came down on his heels, vision closing, nostrils burning. He fell backward onto a convergence. His shoulder was throbbing already, but at least it still supported the weight of an arm.

A trio of coralskippers streaked past overhead, their noses pouring plasma balls toward the center of the basin. Coughing, fighting to stay conscious, Jacen sat up and saw the stolen frigate lumbering skyward beneath the bombardment.

[...]

Jacen activated his comlink, but was interrupted by a familiar burping sound. He rolled over his good shoulder and came unsteadily to his feet. A fan of brown mucus landed where he had been lying, then the voxyn began to advance. The acrid stench of her blood staggered him, made his lungs burn and his head spin, and nearly sent him tumbling down onto a dovin basal.

The queen reached the convergence and stopped. They were separated now by a sizzling pool of her acid. Jacen brought his lightsaber to middle guard, tip angled forward, his wounded arm hanging limp. Behind the voxyn, the hundred-meter bulk of a yorik coral corvette swept in and cut him off from the rest of the strike team. They were battling now, his friends and a whole flotilla of arriving Yuuzhan Vong.

A wave of nausea dropped Jacen to a knee. Eager to press the advantage, the voxyn gathered herself to spring.

A thermal detonator splashed into the pool of acid. The fuse had not been activated, but that was all Jacen saw before the silver casing sank into the sludge.

"Could that be important?" Vergere called. She was coming toward him, thin arms extended for balance. "I saw you drop it."

Jacen's jaw fell. "How did you—"

"No time."

Vergere pointed. The voxyn was scrambling along the edge of the convergence, fleeing the silver sphere. The detonator could never ignite without a properly set fuse, but what did the queen know about detonators? All spheres of shiny silver were spheres to be feared.

Jacen sprang feet-first, caught the queen dead center, heels driving high into her ribs, forcing her over the edge. She dug her claws deep into the yorik coral and saved herself. Jacen landed beside her, hard, and the breath left his burning lungs. The darkness began to rise inside him.

No, tried to rise. He stabbed his lightsaber into the yorik coral and began to cut it from beneath the queen's claws. Still intent on escaping the detonator, she released her front leg and reached for the adjacent wall, then her support began to crumble, and her front quarters slipped into the cell. She brought her tail around, the poisonous barb driving for Jacen's neck. He ducked behind his wounded shoulder, took the tip in an open gash, felt venom pulsing into his torn flesh. Hot. Stinging.

Too weak to kick, Jacen pushed with the Force. Another leg came free. The queen, also weakened by injury, slipped deeper. A foot grazed the dovin basal, then she was plummeting over the edge, collapsing in on herself, shrinking out of sight.

Jacen did not see the final flash of color. The barb tore free of his shoulder, and he was overwhelmed by dizziness, collapsing backward onto the convergence.

Source: The New Jedi Order - Star by Star

Sending the warriors to attack the shuttle has left the battle cruiser all but undefended. Jacen creates a diversion by attacking the voxyn queen single-handedly, allowing Vergere, Tenel Ka, and the other Jedi to capture the enemy cruiser. While the ship moves away to help Jaina and the Jedi at the downed shuttle, Vergere and Jacen remain behind to deal with the voxyn queen.

With Vergere's help, Jacen slays the voxyn queen—but the battle is long and terrible and leaves Jacen too weak to escape.

Source: The New Jedi Order Sourcebook

The voxyn queen is twice as large as an ordinary voxyn and despite not being trained to hunt and kill Jedi, she is still a "far more dangerous" opponent:

The voxyn created by the Yuuzhan Vong required a baseline template, one that could be used to clone an entire species. The template is a mature voxyn capable of asexual reproduction—albeit in a sense that the Yuuzhan Vong consider acceptable. This baseline creature, the voxyn queen, is a vicious, cunning monstrosity twice the size of an ordinary voxyn and far more dangerous.

The 4.6 meter-long voxyn queen possess the same dangerous tail poison as vornskrs, only more potent. She can spit poison and screech as her children can. As if her offensive capabilities were not enough, the voxyn queen is also particularly difficult to kill. Her fast healing ability allows her to recover quickly, and her extra vitality ensure that she stays at peak efficiency for a long time. Unlike her progeny, the voxyn queen is cunning enough to take advantage of her surroundings to overcome her opponents. The queen frequently practices hit-and-run tactics to weaken her targets, using the environment to conceal herself before striking.

Source: The New Jedi Order Sourcebook

During his time as a prisoner among the Yuuzhan Vong, Jacen had his connection to the Force severed by Vergere as part of his "training" and underwent a drastic change, being able to endure severe amounts of pain without letting it control or affect him. Towards the end of his time in the Nursery, Jacen coerced a group of 17 amphistaffs to aid him in his fight against the Yuuzhan Vong warriors in the area, and used his emphatic ability to use their senses as his own as a way to compensate for not having the Force to help him in combat. The fight starts with Jacen cutting an unarmored one in half and then ducking, dodging, and stabbing another one while dodging thud bugs and leading others back to their owners:

Jacen Solo sprints into battle.

As he runs, he makes an image in his mind. The amphistaff he carries matches itself to this image, coiling more than half its length around his forearm. An internal pulse from its linked chain of power glands generates an energy field that rigidifies its semicrystalline cell structure, locking it in that form: a meter of it extends from his right fist, tipped with a double-handspan blade. The same field that rigidifies the amphistaff extends a fractional millimeter beyond the blade, giving it an edge no thicker than an atomic diameter.

So it is that when one of the unarmed warriors springs to bar Jacen's path, hands wide to grapple, the blade passes with only a whisper of resistance through flesh and bone. One arm spirals lazily through the air, showering droplets of blood; one leg topples sideways, twitching in the grass. Jacen does not even break stride.

The remaining two unarmored warriors decide they should leave him to their better-equipped comrades.

Thud bugs hum through the air around him, but the eyespots of the amphistaffs wrapped Jacen's body are infrared—and motion-sensitive; he is able to integrate their emphatic reactions into a full-surround field of perception that is not dissimilar to the Force itself—and he has trained for years to avoid weapons that he can only barely perceive. The greensward blossoms with scarlet detonations as he dodges, dives and rolls, comes to his feet, and keeps running.

Dozens more thud bugs curve toward him, homing like concussion missiles as he sprints straight at the oncoming squads of heavily armed warriors. The nearest warrior thrusts his amphistaff at Jacen like a force pike. Jacen dives beneath its point, rolling forward on his shoulder, stabbing upward; his blade enters the warrior's body at the joining of pelvis and thigh. The pursuing thud bugs detonate massively, scattering warriors like toy soldiers swiped away by the invisible hand of a giant child as Jacen's momentum completes the roll, bringing him to one knee and driving the blade upward through the warrior's groin and entrails and chest.

Only energy fields like its own can withstand the amphistaff's edge; the shells of vonduun crabs are intricately structured crystal, reinforced by a field generated by power glands very similar to those of the amphistaff itself. But that field protects only the shell; beneath their shells, vonduun crabs are soft, and when Jacen's blade slices through the crab's field-nerve cable from the inside, the armor might as well be made of bantha butter.

A multiple blast bug detonation slaps the warrior forward, and Jacen's blade shears through spine and armor alike to burst from the warrior's back in a fountain of gore—and slices as well through the warrior's blast bug bandolier. As Jacen rolls backward with the concussion and kicks free of the shuddering corpse, he grabs the severed bandolier. An instant later, he is up again, running, staggering, stumbling, deafened and half stunned by the explosions. Behind him, the warrior squads scramble and regroup. Jacen ignores them.

All his attention, all his concentration, all his will, is focused on the blast bug bandolier in his hand.

The bandolier is bleeding from its severed ends; dying, its sole wish is to release its children—the blast bugs locked in its linked belt of hexagonal germination chambers—so that they might fulfill their explosive destiny. Jacen can keenly feel its desire. In the emotional language of his emphatic talent, he promises the ultimate satisfaction of this desire, if the bandolier will only wait for his signal.

Ahead, the remaining two squads draw themselves into a tight wedge, its point toward Jacen, its broad base covering the bacta-tank-sized tub that holds the shreeyam'tiz. As more blast bugs hum toward him from all directions, Jacen heaves the bandolier overhand like a proton grenade; it twists lazily, high through the stark noon.

With his emphatic talent, he projects a pulse-hammer thrill of anticipation teetering over the brink to fulfillment, a shuddering surge of adrenaline that would roughly translate as—

Now!

The bandolier flares into a starshell over the base of the wedge at the same time as the blast bugs targeted on Jacen arrive in a thundering swarm, striking him and the ground and the warriors nearby indiscriminately, concussion bursts battering them all helplessly this way and that, ending with Jacen finally blown off his feet into a high spinning arc through the air.

As the inside-out world wheels around him in a darkening blood-tinged whirl, Jacen has time to feel the agony from his slave seed-web suddenly ease and to push an exhausted emphatic invitation down through the slave seed. All right, my friend. Now it's your turn.

The blood-tinged darkness swallows him before he hits the ground.

Source: The New Jedi Order - Traitor

EDIT: The fight ends here and although the text only describes him engaging two warriors and later has Nom Anor point out that he only killed about two or three, the warriors were never Jacen's target. He had always wanted and ended up succeeding in killing the shreeyam'tiz, a creature brought into the Nursery that interrupted the dhuryams' connection to the slaves.

Jacen fights a group of Yuuzhan Vong warriors that were chasing and hunting him down on Yuuzhan'tar, down into the crater during a severe thunder and rain storm. He fights the first one off by using his new Vongsense to connect with the warrior and basically be able to know every move he would take after using this ability to make the warriors' amphistaffs useless against him. He fights the first warrior unarmed and knocks him out by using him as a human shield for a group of thud bugs thrown at him, and then the he kicks another Yuuzhan Vong warrior in the chest that described it as being hit by a speeder:

Now, all he felt was a fierce rise of predatory joy as a warrior raised his amphistaff and crept toward a small white-robed human shivering in a corner at the meeting of two broken walls, and only when a tall shadow loomed through the curtain of rain right in front of him did Jacen realize that the small white-robed human who was about to die was himself.

Lightning blasted overhead as he twisted, and the amphistaff blade only scored his ribs before stabbing deep into the duracrete of the wall at his back. In the ringing darkness that followed the flash he let the knapsack drop off his shoulders, catching one strap as it fell; while the warrior yanked his amphistaff free, Jacen swung the knapsack two-handed and slammed fifteen kilos of cans and equipment into the warrior's face. The warrior staggered backward and Jacen pounced, swinging again, landing solidly, buckling the warrior's knees.

Jacen spun the knapsack overhand to smash the warrior straight down to the ground, but the warrior lifted his blade to parry, slashing the knapsack in half, scattering protein bars and canned synthmilk, shearing the electrobinoculars neatly in half and stabbing into the electronic guts of the datapad—which exploded into blue-white sparks that lit up the rain and scaled the length of the amphistaff to scorch the warrior's hands.

The warrior hacked a glottal curse as his hands spasmed involuntarily. Smoking, the amphistaff fell limp to the ground between them. Jacen grimaced as pain bit his own hands, chewing its way up his arms—but it wasn't his pain.

This was pain from the warrior's burns.

When the warrior leapt to attack unarmed, Jacen met his attack effortlessly, pivoting slightly so that the warrior's spiked boot missed him by a centimeter. The warrior skidded, caught himself, then twisted and fired a lightning punch overhand toward Jacen's temple. Jacen tilted his head a fraction, and the punch only ruffled his hair.

"If you don't stop," Jacen said, "I'll have to hurt us."

The warrior snarled and swung his knotted fists. Jacen flicked the first punch aside; the second, he parried with an open palm as he stepped forward, swinging his own doubled arm, so that the warrior's knuckles slammed into the point of Jacen's oncoming elbow. The warrior howled as his knuckles shattered, and a blaze of alien pain ignited in Jacen's arm: splintered bones stabbing through third-degree electrical burns.

"I can do this all day." He could: the warrior might as well have been a part of Jacen's own body. He could no more fail to meet an attack than one of his hands would miss the other in the dark. He would feel every scrap of whatever pain he inflicted, but so what? It was only pain.

And the rest—

He let himself go, moving light and easy, counters to every attack as clear and obvious and predictable as a form he'd done a thousand times: like training with Jaina, when their Force talents and their twin bond had made them practically one person. More warriors sighted the fight—the dance—and thud bugs snapped through the air, and Jacen actually felt he should apologize as he gracefully faked the warrior off balance and then took his outstretched arm and spun him into their path. The thud bugs hit him like hammers. Vonduun crab armor saved his life, but transferred enough hydrostatic shock to snuff his consciousness like a switched-off glow rod.

Jacen felt that, too: an eyeflash of blackout that staggered him.

When his eyes cleared, three warriors had him boxed.

Knowing how they would attack wouldn't help; no one alive could move fast enough to dodge. The warriors slashed at him, amphistaffs lengthening with whipcrack speed. None of the blades even grazed him.

He had not moved.

To the nerve nodes that served as all three amphistaffs' primitive brains, Jacen suddenly appeared to be a—small, disturbingly misshapen, but still unmistakable—amphistaff polyp; uncounted millennia of natural selection had hardwired amphistaffs against cutting polyps.

Well, that worked okay, Jacen thought. But once they drop them and come after me barehanded, I'm cooked.

So he attacked.

He took three running steps for momentum toward the one on the left and sprang into the air. The warrior's instinctive reaction—to lift his amphistaff and spear Jacen through his guts—did him no good at all, because the amphistaff dropped limp between his hands and the warrior could only gape in astonishment as Jacen slammed both feet into his chest and flattened him as if he'd been hit by a speeder.

Jacen hit the ground running, and never looked back.

Source: The New Jedi Order - Traitor

NOTE: Jacen makes a run for it after kicking down the second Yuuzhan Vong warrior and is then rescued by Vergere, so the fight effectively ends here.

Jacen uses his lightsaber, a blaster, and two grenades to hold off several hundred Yuuzhan Vong warriors and a few voxyn with the aid of several tunnels and corridors to keep the enemy at bay. The area he was fighting was also in low gravity, so he had not only that to help but also the fact that he could bottleneck them with the tunnels and corridors while using his blaster to keep them at bay and lightsaber for defense. Once his blaster runs out of power he starts attacking the Yuuzhan Vong with Force Lightning powerful enough to knock them out before the area is decompressed and the alien warriors suffocate:

His expanded Vongsense filled the moon. The sheer number of enemy warriors was intimidating, but he still hoped that, with luck, his plan would succeed.

Unfortunately his equipment was sparse. He had just his lightsaber, plus the blaster pistol and the two grenades that were in the X-wing's survival kit. But he could fight with Yuuzhan Vong weapons if he needed to, and if he got the jump on some enemy warriors he could equip himself with their gear.

And then he felt the mental surge of a voxyn looking for him, and he pushed out with his Vongsense, tried to convince the voxyn not to see him. But he wasn't expert enough—there was a mental click of the voxyn locking on to him, and he heard a distant howl that echoed down the shaft, followed by a surge of glee and determination from hundreds of Yuuzhan Vong warriors, and he knew he was being hunted.

He reversed direction—there was no possibility now of catching the Yuuzhan Vong by surprise. It was time to find one of those narrow corridors he'd been thinking about.

Jacen found a right-angle bend in the corridor and decided to make a stand while he still had the options for retreat. He stationed himself behind a curve in the tunnel and ignited his lightsaber, then primed one of his two grenades and held it in his left hand. Objectively he considered the use of the Vongsense in combat—he could influence some of the enemy weapons, render them useless—but decided against it. There were simply too many enemy coming for him. He could convince a few of their amphistaffs to bite their owners or go limp, he could convince a few thud bugs to go off prematurely—but he couldn't influence them all.

The Force was better for this situation. He let his Vongsense ebb and called the Force to him.

He heard the enemy rush toward him, shouts and the rush of feet. A horde packed into the corridor, skimming along under the light gravity.

The ultrasonic screech of the voxyn caught Jacen by surprise and almost paralyzed him—he had forgotten how numbing and terrifying the sound was. He wrenched himself free of the shock and hurled the grenade around the corner, exposing his head just enough to use the Force to guide the grenade down the open mouth of the voxyn. The voxyn, in its turn, was spitting toxic sludge at Jacen, but Jacen used the Force to catch the acid stuff and flung it back in the direction of the enemy warriors.

What shocked him was the number of those same warriors. It was one thing to sense them coming; it was another to actually see them, and at close range. They seemed to go on forever down the tunnel. There were hundreds . . .

He ducked back around the corner as the grenade took off most of the voxyn's head. Jacen knew that even this was unlikely to kill the creature, so he drew his blaster pistol with his left hand and began firing around the corner again, at the voxyn and at any enemy warriors behind it.

The voxyn, blinded or mad with pain, thrashed in the corridor with amazing energy and incredible speed. Its flogging tail had already brought down a number of warriors, but as Jacen began firing, again exposing only his hand and head, the Yuuzhan Vong gave a shout and surged forward, right over the thrashing voxyn, some even shoving the creature ahead of them as they impaled themselves on its poisoned spikes. From the warriors' hands came a rain of thud bugs.

Jacen leapt back from the corner, parrying wildly with his lightsaber as the thud bugs soared toward him, either making the sharp turn or bouncing off a wall and then coming on. One bug hit him on the thigh and spun him around, and he used the Force to maintain the spin, his lightsaber a green blur as he batted the missiles away. He made a complete turn and then used the Force to hurl himself backward down the tunnel while he parried with his lightsaber and fired the pistol left-handed to discourage the Vong from rounding the corner.

He didn't discourage them. The first half dozen went down in a sprawl alongside the wounded voxyn, but then the rest came on, a long column of them, shouting their battle cry.

"Do-ro'ik vong pratte!"

From behind them somewhere came the cry of another voxyn.

Jacen fired round after round from the blaster, though he knew it would do no good. And somewhere in the Force, he felt Jaina's anguish.

[...]

Jacen had decided he might as well make his stand. The mineshafts branched and narrowed, branched and narrowed, and when the roof got less than two meters high he realized he was out of choices. When the tunnels were so small he could only crouch, then the voxyn would have too great an advantage.

He made a turn into a branching tunnel and readied his lightsaber and blaster. He'd save his last grenade for the next voxyn.

The enemy warriors hurled themselves down the tunnel and Jacen fired on them. Thud bugs and blorash jelly flew at him; he ducked some and cut at others. He was strangely calm.

This wasn't the first time he had made a mistake. And dying was nothing new, either.

It was the thought of Jaina that brought despair. He had failed to help her; and through the Force and their twin bond he felt her own hopelessness.

The Yuuzhan Vong kept coming, dozens of them lunging, charging, hurling thud bugs, spitting poison from the heads of their amphistaffs. Jacen's blaster was running out of charges. His lightsaber was a brilliant green blur as it parried and slashed. Pace by pace, he stepped back into the narrowing shaft.

Jacen felt rage building in him, a red fury that was his response to his own despair. The blaster hummed empty and he threw it at the warrior. And then he remembered the power he could call upon, the power fueled by the kind of despair and anger he felt now and had felt before, and he hurled it at the warrior, the brilliant emerald fire that lanced from his fingertips.

The Force lightning threw the first rank of Yuuzhan Vong back into their comrades, and in the confusion Jacen launched another blaze of fire. He hadn't killed them—the murderous form of lightning was a dark side weapon—but they wouldn't be waking for a long time.

"Young Jedi."

Jacen looked around, and somehow wasn't surprised to find Vergere standing there. "Hello," he said, and fired another sizzling blast at the Yuuzhan Vong.

Vergere looked up at him, her tilted eyes glittering and wise. "You're about to lose your air," she said.

Source: The New Jedi Order - Destiny's Way

EDIT: The fight ends here because Vergere had crashed an A-wing into the station Jacen was on, depressurizing the entire area and killing the rest of the Yuuzhan Vong warriors.

Jacen fights and defeats a Yuuzhan Vong warrior in a short manner of moves. He was part of a team intending to uncover Yuuzhan Vong agents in hiding in the Empire, and gathered a group of human traitors and three disguised Yuuzhan Vong in a room with the intention of "uncovering" the traitors. The plan was to allow them to surrender, but when the third disguised Yuuzhan Vong came into the room, he immediately attacked Jacen and forced the Jedi to defend himself, allowing him to defeat the large alien in a series of moves:

The tension within the room mounted as everyone waited uncomfortably for the last of the infiltrators to arrive. Nothing was said, but the body language of those around the table spoke volumes. Pellaeon estimated that perhaps eight of the eleven sympathizers had already figured out what was happening, with the remaining three probably just having the beginnings of suspicion in their gut. It showed in their furtive eye movements, their flushed expressions, and the way they squirmed uneasily in their seats. The only ones who didn't flinch or show any concern were the two disguised Yuuzhan Vong. What was going on in their minds was anybody's guess.

Finally, the door hissed open and the third Yuuzhan Vong walked in. An enormous man with shoulders as wide as a Wookie's, "Torvin Xyn" took in the scene instantly, his expression breaking into a snarl as soon as his eyes fell upon Jacen.

"Jeedai!" he hissed. "I can smell you!"

A number of those seated started to stand as Torvin Xyn's skin peeled away from his face, revealing the scarred and snarling visage of the Yuuzhan Vong beneath. The skin covering his chest and arms rippled, and suddenly there was an amphistaff in his hands.

Jacen took a step back toward the podium. "There is no need for this," he said. "Nobody need be harmed!"

But even as he spoke, the Yuuzhan Vong let loose an unintelligible roar and launched himself at Jacen. Almost inaudible beneath the alien's deafening war cry was the distinctive snap-hiss of Jacen's green-bladed lightsaber extending. He brought it up between them in a bright blur, sweeping in an arc to deflect the intended blow to his neck from the amphistaff. Then, shifting his weight back onto his right leg, he moved to one side, just enough to miss the charge of the giant alien. The Yuuzhan Vong swept his amphistaff down and around to cut at Jacen's legs as he passed but the Jedi Knight was already off the ground by that point, kicking outward with his left leg to knock the alien off balance. Amphistaff and lightsaber clashed again as the two other spies burst out of their disguises and joined the fray. Realizing they had been discovered, the human sympathizers fell about in a panic.

Any thought that the enemy still had the upper hand was soon dispelled when the door burst open and the squadron of stormtroopers filed in, the snouts of their blasters trained on the aliens. Security droids swooped in behind them. A quick succession of shots brought down two of the Yuuzhan Vong infiltrators. Exposed without their vonduun crab armor, they died with their hideously scarred visages snarling. The final warrior fell when he raised his amphistaff high into the air in readiness to bring it down on Jacen's head, and the young Jedi proved to be too fast. Thrusting his own weapon up high, he managed to block the Yuuzhan Vong's strike when the warrior had barely started the downward swing, then seemingly effortlessly brought his lightsaber down onto the Yuuzhan Vong's torso. Such was the force of the blow that his weapon cut almost halfway through the alien's barrel chest before coming to a halt.

Source: The New Jedi Order - Force Heretic I: Remnant

.

Jacen, Luke Skywalker, Corran Horn, and Saba Sebatyne kill a group of Yuuzhan Vong warriors on Zonoma Sekot. The warriors were originally thirty strong but had their numbers dwindled by the Jade Shadow firing at the circle that trapped Corran and Tahiri Veila. After the initial firing, the four Jedi engage the warriors off-screen while the book focuses on Tahiri trying to catch up to and kill Nom Anor. After she fails and falls off of the ship he was escaping in, we see Jacen and the other Jedi appear to have killed the remaining Yuuzhan Vong warriors:

"Right," Corran said. "And that's your first lesson for the day—don't hang on to your illusions."

"I was hoping more for a crash course in 'how to kick butt when you're outnumbered thirty to two.'"

"Well, if you're going to be picky about what I teach . . ."

"Quickly!" Nom Anor shouted, from near the ship. "There is little time."

The circle contracted more rapidly. The ground trembled again, and pain pulsed through the Force. Pain and something else—something familiar.

She hadn't had time to sort it out when a track of green laserfire ran through the warriors on their right flank, then their left, and suddenly a gleaming spacecraft came into view. It dropped to hover a few meters off the ground.

"Jade Shadow!" Corran whooped. "It's Mara and Luke!"

Even as he said it, the landing ramp dropped down, and Luke Skywalker and Jacen Solo leapt out, followed by the hulking reptilian figure of Saba Sebatyne. Three new lightsabers flared to life. Then the Shadow leapt back up, turned, and began raining fire on the Yuuzhan Vong craft.

The remaining warriors shook off their stupor and charged, but Tahiri ignored them, tearing through one of the gaps cut by the Shadow. Nom Anor wasn't watching her—instead he was dodging laserfire, trying to reach the landing ramp of the Yuuzhan Vong ship. He made it there only a few meters ahead of her, but as soon as he was on it, it began to retract.

With a war cry, she hurled herself through the air, landing on the ramp, sweeping her lightsaber toward the executor's head.

Nom Anor ducked at the last instant and her lightsaber cut into the coral hull. He scrambled away from her, and she started to follow, but the ship suddenly bounded up from the ground, twisting as it went. Tahiri lost her footing and fell. She grasped at the edge of the retracting ramp and missed, but caught the edge of a plasma cannon with her left hand. Furiously, she cut at the hull with her lightsaber. It resisted the blow, and her weight suddenly tripled as the ship went into drive. She lost her grip and went whirling back to the ground, landing so hard all of the wind went out of her. She lay there, trying to recover, watching helplessly as the yorik coral vessel bored up through the atmosphere with Jade Shadow in hot pursuit.

Another wrenching wave of pain from the planet lashed at her, and again the ground shifted. Wheezing, she forced herself to her feet.

Corran, Luke, and Jacen were trotting toward her. Saba was standing at the edge of the clearing, staring out at the towers. The Yuuzhan Vong warriors all appeared to be dead.

Source: The New Jedi Order - The Final Prophecy

Jacen, alongside Jaina and Luke, fight off several attacks from Yuuzhan Vong warriors as they climb the staircase to Shimrra’s citadel. They met resistance on the eighth level and sometimes had to fight and defend in such tight spaces that two people couldn’t stand face to face:

That still left the problem of how to reach Shimrra’s bunker, but it didn’t take the Jedi long to discover a narrow stairway that hugged the Citadel’s curved perimeter as it wound toward the summit. Luke led the ascent, with Jaina close behind, and Jacen a few steps behind her, silently thanking the World Brain for interceding at the western walkway, and reaffirming his promise to end the dhuryam’s inner turmoil.

Carved from the same yorik coral that made up the fortress’s unpolished hull and bulkheads, the stairway was a continuous spiral, occasionally walled in on both sides, but more often climbing without an exterior handrail through maintenance rooms and expansive living chambers. Dilating membranes sealed each individual level, and access corridors connected the stairway to interior spaces. The Citadel shook with each seal the Jedi violated, as if each rupture sent a measure of pain through the living vessel. But the shaking could just as well have been a response to the ceaseless bombardment by starfighters, if explosions triggered by Page’s Commandoes as they fought their way into the lower levels.

Judging by the way the sinuous stairway had been engineered, and the layout of the interior spaces, Jacen realized that Shimrra’s worldship had obviously flown upright through space—a veritable mountain rather than a flattened oval or projectile-shaped vessel, such as the Jedi and Alliance forces had encountered at Helska 4, Sernpidal, Obrao-skai, and other worlds.

It wasn’t until the eighth level that Luke and his niece and nephew met with resistance, but it was clear from the ferocity with which the warriors attacked—from above, below, and through the various access corridors—that the onslaught was likely to continue all the way to Shimrra’s lair, and probably inside it, as well. If the warriors constituted the first line of defense, it was difficult to imagine what might await them at the summit, assuming they could even make it that far.

In most places the stairway wasn’t wide enough for the two people to stand abreast, and in those stretches Luke had to face the brunt of the attacks. He was his own vortex, deflecting amphistaff strikes, whiplike lashes, and spurts of deadly venom; dodging or redirecting flights of thud bugs; parrying the thrusts of coufees, to side-step, duck, maneuver his body in ways that seemed to defy gravity. Stunned or burned by Luke’s green blade, thud bugs were ricocheting from the walls and high ceiling, chipping away at the yorik coral surface. Dropped in their tracks, warriors sprawled with hands pressed to stumps of legs and opened foreheads, or with black blood welling where lightsaber had found defenseless areas between living armor and tattooed flesh.

Jacen recalled watching his uncle on Balkadan, where the war had begun, wielding two lightsabers when he had come to Jacen’s rescue. But the rescue on Balkadan paled in comparison to the control Luke demonstrated now.

[...]

Jacen and Jaina were astounded—but they had little time to reflect. Their lightsabers were busy, as well, turning the blows Luke dodged, or defending assaults launched from below.

On the fourteenth level, where the Citadel’s exterior wings sprouted from the hull, they reached a fork in the stairway.

Source: The New Jedi Order - The Unifying Force

Shimrra’s Citadel is referred to as a "mountain" many times throughout the novel:

From the bridge’s southern abutment, the Jedi had their first unobstructed view of their objective. Several kilometers to the east, illuminated by forking lightning and accented by the laser beams of circling starfighters, Shimrra’s Citadel towered above the infernal landscape. A veritable mountain, it stood where the Imperial Palace once had, encompassing everything from the Mon Calamari Inglenook to the Pliada di am Imperium, as the eastern terminus of the Glitannai Esplanade was known. The Citadel’s base was lost in swirls of dark smoke, but halfway to the rounded summit four walkways approached from separate directions, linking the Citadel to surrounding structures.

This close, the mountain was revealed to be as craggy and pocked as any of the Yuuzhan Vong worldships Luke had seen.

[...]

Streaking east from the now-Alliance-occupied landing field, he wove the snubfighter through a hail of ascending plasma fire and descending wreckage. Dominating the forward view was the rounded summit of Shimrra’s fortress, rising from the thick blanket of cloud cover and smoke that smothered most of the sacred precinct. Only two years earlier the elegant summits of dozens of spacescrapers would have been visible above the clouds, but now there was only the craggy mountaintop.

[...]

Even without the insatiable voids that were engulfing nearly every starfighter volley, the Citadel appeared to be impregnable. It was like attempting to blow apart a mountain.

[...]

Pinned down in a grove of fingerleaf trees one hundred meters from the westernmost of the walkways that accessed the Citadel, she and Luke were fending off streams of attack bugs that were hurtling down from lookout aeries in the holy mountain.

[...]

Far below the concourse, at the base of the Citadel, a dark maw accessed the lower depths of the mountain.

Source: The New Jedi Order - The Unifying Force

Jacen, alongside Luke Skywalker and his twin sister Jaina Solo, fight and defeat 15 Yuuzhan Vong Slayers. The slayers immediately sense that Jacen and Luke are stronger fighters than Jaina, who has already defeated Tsavong Lah in combat, and prepare four warriors for him to fight. Jacen is struck in the ankle by an amphistaff early in the fight which is enough of a hindrance to make him fall against a wall. During the fight, the room they were in was shifting and moving because the World Brain, the dhuryam responsible for terraforming Coruscant, had decided to reject Shimrra's orders and go against the Yuuzhan Vong leader which caused Onimi to take control of the room. The room shifted at least six times throughout the fight but it was because of this shifting that Jacen believed saved his life. Despite his ankle injury, despite being outnumbered, despite the slayers having more skill than the best regular warrior, and despite Onimi controlling the slayers like a yammosk controlled a fleet, Jacen's unique relationship with pain, training with Vergere and his constant use of Force leaps and acrobatics allowed him to hold his own and survive:

Luke, Jacen and Jaina at last penetrated the inner sanctum of Shimrra’s palace. The Supreme Overlord and his capering jester Onimi sent a phalanx of Slayers against the Jedi trio, only to see their finest warriors struck down.

Source: The New Essential Chronology

Jacen and Jaina Solo accompanied Luke to the surface of Coruscant to bring Supreme Overlord Shimrra to justice. Upon entering Shimrra's throne room, they were beset by a group of 15 Slayers. When Jaina set out to capture Onimi, Luke found himself facing Shimrra himself, as the surviving Slayers focused their attention on Jacen.

Source: The Complete Star Wars Encyclopedia

Luke and the twins breach Shimrra’s citadel—which also becomes a spacebound vessel—where they are nearly overwhelmed by slayers. Luke gives himself fully to the Force, becoming a whirlwind of devastation, slashing through Yuuzhan Vong guards. Shimrra engages Luke in a duel, his amphistaff of command against Skywalker’s paired lightsabers. Though Luke is poisoned by amphistaff venom, the Jedi Master decapitates Shimrra, bringing an end to his reign.

Source: The Essential Reader's Companion

Jacen and Jaina Solo then accompanied Luke to the surface of Coruscant to stop Supreme Overlord Shimrra. Upon entering Shimrra's throne room, they were beset by over a dozen deadly Slayers. Luke confronted Shimrra himself and used paired lightsabers to sever the Supreme Overlord's huge head from his body. With the efforts of Jacen Solo, who was able to channel the Force as he had never done before, the Jedi were able to defeat the true power behind the Yuuzhan Vong throne, and bring an end to the conflict.

Source: Star Wars Databank (Old)

While Jaina was dispatching the last of them, Luke whirled and leapt through the opening. Landing in a crouch five meters from the membrane, he held the lightsaber in a one-handed grip extended to his right and slightly behind him. Jacen was the next through, assuming a bent-legged forward stance, with his blade held straight out in front of him. Then Jaina came through, moving swiftly but vigilantly to Luke's left side, with her blade raised over her right shoulder.

Though the floor was level, the walls of Shimrra's circular, high-ceilinged lair were curved. A simple throne occupied the center of a raised dais that was encircled by a shallow moat flowing with what might have been diluted Yuuzhan Vong blood. The far wall contained a much more elaborate entry portal, and to the right of the throne a stairway climbed into the summit of the Citadel, presumably to the command and control areas of the escape vessel itself.

Between the moat and the Jedi stood fifteen warriors of modest stature, arrayed in a semicircle and armed with hissing amphistaffs. They affected no armor, but their burnished and blood-smeared flesh looked as impenetrable as vonduun crab topshells.

Luke recognized them from Han and Leia's description as examples of the specially engineered warriors they had faced on Caluula, and against whom even Kyp had failed. The slayers presented a daunting obstacle, but they were surpassed by the one they were deployed to protect.

[...]

If Luke was at all worried about Jaina and Jacen, if he had any regrets about having brought them to the very heart of the war, he kept his concerns so deeply to himself that they could not be felt by his charges, even through the Force. The strength of their meld was such that the three might have been sharing the same mind, and that mind was the Force itself.

Luke had no doubt that what they were doing was necessary, and in harmony with the will of the Force.

Shimrra's warriors were no less committed to the moment. A threat to all the Yuuzhan Vong held sacred, the Jedi were driven by a dark and incomprehensible power that flew in opposition to the divine edicts of Yun-Yuuzhan and the other gods. No more than did those of the Jedi, the marked faces of the slayers displayed neither anger nor fear—only the full measure of their intent to protect their god-king at all costs.

[...]

Jaina and Jacen sidestepped away from Luke to create thee separate fronts. Then Luke did something neither twin had ever seen him do. Shifting his stance, he called the lightsaber into his left hand. Abandoning form, he encouraged the warriors to attack him.

In swift response the fifteen divided themselves into three groups of four, four, and seven. The quartets began to square off with Luke and Jacen, while the larger group formed up opposite Jaina. Sensing that Luke and Jacen were the stronger fighters, the slayers had decided to reserve most of their might for the Jedi they perceived as being the weakest, guessing that Luke and Jacen would always go to Jaina's aid before attempting to reach Shimrra.

No one moved.

Just when it seemed that the moment would be forever frozen in time, the slayers charged, some with amphistaffs stiffened, others unfurling them like whips, and still other prompting their weapons to spit venom. There were no attempts to engage Luke, Jacen, or Jaina in single combat for personal glory, as had happened on Yag-Dhul and other worlds. The war had gone on too long. All that mattered now was that the conflict be decided, and that there be winners and losers.

Luke's lightsaber was a blur of pure energy as he parried a four-pronged attack. His blade found exposed flesh time and again, but the slayers sustained each searing blow without surrendering ground. The amphistaffs hammered at the lightsaber with such force that flashes of blinding radiance filled the room, projecting giant silhouettes up along the curved walls. In an attempt to forge a united front, and despite battling warriors on three sides, Luke and Jaina began to move toward one another. For a moment, several slayers found themselves trapped between the two Jedi and the lashing movements of their comrades' amphistaffs. Pierced simultaneously from either side, one warrior dropped to the floor; then a second.

Luke vaulted through a half-twisting front flip that landed him back to back with Jaina, killing a third warrior on the way down, with a strike to the top of the head. With some effort, Luke saw Jacen through the Force, pressed hard by the four slayers who had dedicated themselves to him. Again Luke leapt, swinging his blade through the air and cleaving the neck of the most formidable of the slayers attacking his nephew. Two slender amphistaffs shot for Luke's legs, but he managed to jump over both, as if skipping rope, then decapitated the slower amphistaff before it could withdraw.

A coufee swooshed through the air millimeters from his right ear. Crouching, he extended one foot and pivoted on the other, knocking the feet out from under the knife wielder, then amputating the warrior's left foot with a return swing of the lightsaber. Seeing an opening, Luke made a move for Shimrra—only to be dragged down by the dovin basal. Immediately, he rolled to one side, toppling two slayers and removing himself from the gravity field.

Jacen leapt to Jaina's side of the bunker, and the two of them began working in concert to drive a trio of warriors back toward the moat that encircled Shimrra's throne. One of the slayers nearly stumbled into the flow, but caught himself in time. Surging after him, Jacen swung his blade through a backhanded crosscut, which the warrior parried, then answered with a fast chop aimed at Jacen's left knee. Jacen jumped straight up, but not quickly enough, and the amphistaff struck him on the ankle. Landing off balance, he staggered into the wall. Two warriors hurried after him, but made it only halfway when the entire bunker tipped to the right.

The unexpected movement sent everyone, slayers and Jedi alike, scurrying, sailing, and tumbling into the opposite wall. As if mounted on gimbals, the bunker tipped again, this time in the direction of the ruined osmotic membrane, bunching everyone against that wall.

Guessing that Shimrra was responsible, Luke spared a glance at the throne. The Supreme Overlord's clawed hands were indeed in motion, but the expression on Shimrra's face was one of benign bafflement.

The dhuryam, Jacen sent through the Force.

Luke understood.

The World Brain, joining the Shamed Ones in revolt, was causing the entire Citadel to shake, perhaps by rocking the cradle to which it was wed, or by some means beyond Luke's imagining. Self-contained, the bunker was attempting to keep itself level. But cut off from the dhuryam, it couldn't anticipate the Citadel's behavior. Shimrra's hand movements were just that—the idle flutters of a god-king who was forced to accept that he had lost his most powerful ally and weapon.

[...]

But Luke had no time to think further about Shimrra's companion.

The bunker was suddenly in motion again.

[...]

Buried under half a dozen blood-smeared bodies when the bunker had shifted, Jaina used what little maneuvering space she had to avoid amphistaff fangs and venom, the serrated edges of coufees, and the sharpened teeth and hardened elbows and knees of warriors. Out of sheer desperation she tried to use the Force to throw everyone off her, and was bewildered when the crushing weight of the warriors abated—or at least until she realized that the sudden turnabout had nothing to do with the Force. Shimrra's lair had simply tilted again, and now she and the same warriors were sent flying and tumbling toward the opposite wall.

Hurled headfirst for the curved expanse of yorik coral, she just managed to get her free hand out in front and brace for impact. Loud grunts escaped the warriors as everyone hit the wall midway to the arched ceiling, then slid in a jumble to the floor as the bunker attempted to right itself.

Backward-somersaulting from the heap, Jaina shot to her feet and was preparing to Force-leap toward Shimrra when the chamber canted again. This time she used the Force to hold herself to the floor as the half a dozen slayers went rushing past her out of control, some running faster than their legs could carry them, and others sliding on their bellies or backs. Loose amphistaffs tried to sidewind for the safety of the moat, but only a few made it, and the rest were flung hard into the wall. Once more the lair leveled out before tilting a full thirty degrees, and those warriors still on their feet launched themselves at Jaina, only to slip on whatever it was that had sloshed from the moat and was fast slicking the entire floor.

Close to the osmotic membrane, Luke and a sturdy warrior were in the midst of a fierce duel, their free hands clamped on the burned edges of the breach the lightsabers had opened. Though Jaina couldn't see Jacen, she could perceive him behind her, and she could hear the burning hiss of his lightsaber as it connected with the slayers' weapons and armored flesh. In the center of the bunker, giant Shimrra had left his throne and was tottering toward the moat, his powerful amphistaff unfurled and serving as a kind of walking stick. Also in motion was Shimrra's companion, who was making steady if tortuous progress toward the curving stairway that climbed into the summit.

[...]

Jaina rushed to grab hold of the ladder as the bunker tilted. From below came the sounds of bodies being hurled one way, then the other. In the midst of the swaying she heard the thrum of Luke's and Jacen's lightsabers, and the agonized cries of at least two slayers.

[...]

Only the Force was keeping Jacen from succumbing to the pain—the Force and what he had learned from Vergere during the indeterminate amount of time she had kept him in the Embrace of Pain—breaking him. While under his mentor's tutelage he had been able to go into himself to meet the pain on its own terms. Now he didn't have that curious luxury, because he was having to call on all his abilities to keep from being killed.

If not for the swaying of the Citadel and the effects of its unpredictable oscillations of Shimrra's coffer—his escape vessel—Jacen figured he would already be dead. That was the World Brain, having finally decided which side it was on. The trouble was, that decision mattered only to the reshaping of Coruscant and not to the Supreme Overlord, who was clearly able to control objects in his immediate environment without need of the dhuryam.

The slayers, for one thing.

Where initially they had been moving with individual vigilance and of their own accord, they were now moving as coralskippers did under the control of a coordinator. The change had come simultaneously with Shimrra's rising from the throne, and the escape of his Shamed One companion, whom Jaina had pursued into the summit of the Citadel. Jacen knew that her exit had been prompted by something she had perceived through the Force, but he and Luke could have used her lightsaber now.

Three slayers had Jacen backed to the bunker's outer wall. Even through his Vongsense he could not predict their actions, or where their thrashing and thrusting amphistaffs were going to strike next. He had managed to evade copious sprays of venom, but his torso had taken countless lashings; his limbs were bruised by the heads and coils of the serpentine weapons—though none had yet been successful in sinking fangs into him. His lightsaber had returned as many blows, but the slayers seemed to be largely immune to pain, if not indestructible.

A half dozen corpses were sprawled on the floor, sliding or rolling with each random cant of the Citadel. But more than the lightsaber, it was acrobatics that was keeping Jacen from being overwhelmed by the specially engineered warriors. Time and again last-moment leaps had carried him out of the range of their shapeshifting weapons, as the fight moved along the perimeter of the throne room. The gravity-tweaking dovin basal set in the base of the throne made it impossible for Jacen or his opponents to venture closer to the throne than the shallow moat that encircled it without being tugged violently to the yorik coral floor.

Jacen took advantage of the gravitic anomaly now, as one of the slayers lunged for him. He leapt high into the air, and the warrior flew under his feet, only to be pulled to the floor facefirst, so that by the time Jacen had twisted in the air and landed he was able to drive his blade into the small of the warrior's back, almost pinioning him to the floor. The other two immediately rushed him from behind. Unleashing his amphistaff, one warrior managed to wind the weapon around Jacen's legs, while the other swung his amphistaff at Jacen's head. Ducking the swing, Jacen leapt again, taking the attenuated amphistaff with him. Yanked from the warrior's grasp, the weapon unwound and dropped before it could strike.

Across the room Shimrra was moving swiftly toward Luke, who was being set upon by four warriors. The enormous Vong overlord stepped across the moat as if crossing a final line. Seemingly entranced—in sway of the Yuuzhan Vong gods—he fixed his glowing eye implants on his prey. He held the thick-bodied amphistaff diagonally in front of him, with his giant left hand closed around the middle of the weapon's three-meter-long body.

Jacen sent a warning to his uncle through the Force, which Luke acknowledged—not only through the Force but also by spinning away from the warriors to provide himself with enough fighting room to confront Shimrra. Whirling through a cartwheel, Luke caught one of the warriors on the chin with the heels of his boots, unbalancing him enough so that Luke could get inside the arm that held the amphistaff and drive his lightsaber through the warrior's neck. As he quickly withdrew the blade, a second warrior was ready to pounce; Luke stretched out his left hand and impaled the slayer through the right eye. At once the other two converged on him, battering him with their apmhistaffs and coufees, opening ragged wounds in his upper arms and chest.

[...]

One of the warriors stalking Jacen abandoned him to engage Luke. Jacen moved against the others, the shorter of whom feigned a strike at Jacen's right leg, then twirled the amphistaff in his hands and slammed the tail end of it into Jacen's right cheek. Reeling from the blow, he staggered within range of the dovin basal, which dragged him to the floor on his back. The short warrior hurried in, his weapon striking at Jacen like a serpent, then stiffening, jabbed him hard in the left forearm, as if to stake the arm to the floor.

Jacen twisted out from under the attack, grasping that Luke had again been pressed to the wall. Having killed three of his assailants, he was facing only one opponent, but his energy was beginning to flag. It was not fatigue born of fear of going to the dark side, but simple exhaustion, and Shimrra was moving in. Eager to award the kill to the Supreme Overlord, the slayer closest to Luke turned and ran at Jacen with his amphistaff held overhead like an ax, intent on splitting open his victim's forehead.

Jacen could feel Luke call deeply on the reservoir that was the Force.

From Luke's left hand gathered a blinding tangle of energy manipulated into being by the raw power of the Force. As if hitting an invisible wall, the warrior stopped short, then spasmed as green sparks began to coruscate around him. Enveloped, he fell like a tree.

Still twisting and writhing away from the snapping amphistaff, Jacen used his Vongsense to dampen the effect of the dovin basal, allowing him to move out of its gravitic field and get to his feet. His short opponent howled in outrage and whipped the amphistaff. Jacen allowed it to coil around his body; then, as the warrior was reeling the weapon in, Jacen hurled his lightsaber deep into the slayer's armpit.

The bunker inclined, sending Jacen directly toward Shimrra. Without thinking—and without his lightsaber—he lunged for the neck of the towering Yuuzhan Vong. But Shimrra perceived Jacen's intent, and threw his mighty right arm behind him. Jacen was hit squarely in the center of the chest.

Dropping to the floor, he blacked out.

When he came to an instant later, he saw that Luke had obviously intercepted Shimrra's follow-up blow.

Source: The New Jedi Order - The Unifying Force

Yuuzhan Vong slayers were noted as being muscled and with quick reflexes, with skin impervious to lightsabers and blaster bolts:

Compact and heavily muscled, they had dark, scarless skin that was impervious to lightsabers and blaster bolts, and were gifted with fighting reflexes faster than the greatest warrior champions.

Source: The New Essential Guide to Warfare

Moving directly to one of the slayers, Qelah Kwaad ignited the lightsaber, raised it to her opposite shoulder, and, with a slashing motion, drew the violet blade diagonally across the slayer’s chest.

The smell of burned flesh wafted through the hall. Shimrra turned slightly to face the commanders. “Only a furrow where any one of you would lie in two pieces on the floor.”

Source: The New Jedi Order - The Unifying Force

Yuuzhan Vong slayers are so skilled that two of them were able to defeat a group of ten Yuuzhan Vong warriors and their commander in a short amount of time and wielded superior weapons than the ones the warriors did:

Chaan snapped his fists to his shoulders and summoned ten warriors to their feet; coufees, shields, tridents, and amphistaffs woke to the challenge. At the same time, the warrior-priests spread out, but only two stepped forward.

"Two against eleven," Chaan said in sudden consternation. "This is vulgar. Dishonor either way!"

Shimrra returned to his throne and sat. "Then we will be pleased to see you humble them, if only to demonstrate that our shapers have failed in their task. Carve them, Commander, as a dish fit for the gods."

Chaan saluted crisply.

At his curt nod, the ten warriors attacked, two groups of four moving to outflank their opponents, and the remaining two rushing forward immediately to engage and distract. The reactions of the warrior-priests were almost too fast to follow. They turned slightly to the side, almost back to back, wielding weapons in both hands, meeting the frontal attack and the flanking attacks simultaneously.

The amphistaffs of the attackers struck seemingly unarmored flesh without finding purchase. Coufees cut and sliced, and yet almost no blood flowed; what little did, congealed instantly. The melee weapons of the defenders were no less enhanced than were the small, muscular warrior-priests who wielded them. The specially bred amphistaffs snapped the heads off their lesser cousins, and stabbed with enough force to paralyze, even through armor. The slayers—Shimrra’s Jeedai—leapt to great heights, twisting in midflight and landing behind their attackers, then rushed in, arms windmilling in a blur, gouts of black blood flying in all directions. One by one and sliced to pieces, Chaan’s warriors dropped to the floor.

Silence gripped the hall as the elite of all castes watched with a mix of awe and dread. Shimrra was already powerful enough without this royal guard. Now he was no match for any domain that might think to thwart him.

The fight was over almost as quickly as it began, with the ten warriors—and Chaan—felled and bleeding, and the two warrior-priests unmoved by what they had done, their slender amphistaffs badged with blood.

Source: The New Jedi Order - The Unifying Force

Jacen and a group of Jedi use Force Jumps to make their way up a 300 meter slope of sand. They do so while also having to deal with a Chiss drop ship firing charric beams at them which pack more kinetic charge then normal blaster bolts and are strong enough to disarm a few of them from the effort of deflecting the bolts:

Jaina and Zekk and the others continued to ascend the slope in Force leaps, but there was no sign of any healthy Killiks—either the laser cannons had gotten them all, or the survivors were staying hidden.

The turbolaser strikes continued to come, obscuring the Jedi Knights' vision and slowing their progress, but failing to stop them entirely. It was difficult enough to hit moving targets from orbit, without those targets having the Jedi danger sense to warn them when a strike was headed their way.

The team was halfway up the slope when the turbolaser barrage suddenly ended.

[...]

Then the drop ship's belly turret spun toward the Jedi and began to stitch the slope with fire from its twin charric guns. Jaina, Zekk, and the others raised their lightsabers and started to knock the beams back toward the vessel. Unlike blaster bolts—which carried very little kinetic charge—the charric beams struck with an enormous impact. Several times Jaina, Zekk, and even Lowbacca felt their lightsabers fly from their grasps and had to use the Force to recall their weapons.

The Jedi Knights continued up the dune in sporadic leaps, taking turns covering each other, seeking the protection of craters or mounds of sand when they could, but always advancing toward the crest of the dune and the bomb.

[...]

Now that the laser cannons had fallen silent, Jaina leapt out of the crater and led the charge toward the top of the dune. Half the Chiss commando squad stopped and started to lay fire down the slope, while the rest raced the last few meters to the bomb and began to string a linked line of vape charges around it.

Jaina and the other Jedi Knights continued their ascent, deflecting the charric beams back toward the Chiss who were working to set the charges. Four of these commandos fell before their fellows realized what the Jedi were doing, but the survivors were too well trained to lose focus.

By the time Jaina and the others neared the crest of the dune, the charges had been placed and the survivors were scrambling to rejoin their companions.

[...]

As Jaina made her accusation, she and Zekk were turning back toward the bomb—now about three hundred meters above, still at the top of the dune.

Source: Dark Nest III: The Swarm War

NOTE: After the Jedi reach the top of the dune, the Chiss activate charges they set on the "bomb" mentioned in the text, which forces the team to Force Jump back down the dune to get away from the imminent explosion.

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