Space Marines Respect Thread!

Secondary Heart

Phase 1: This simplest and most self-sufficient of implants allows a Space Marine to survive his other heart being damaged or destroyed, and to survive in low oxygen environments. Not just a back-up, the secondary heart can boost the blood-flow around the Marine's body.

Ossmodula

Phase 2: A small, complex, tubular organ, the ossmodula secretes hormones that both affect the ossification of the skeleton and encourages the forming bone growths to absorb ceramic-based chemicals that are laced into the Marine's diet. This drastically alters the way a Space Marine's bones grow and develop. Two years after this implant is first put in the subject's long bones will have increased in size and strength (along with most other bones), and the rib cage will have been fused into a solid mass of bulletproof, interlocking plates.

Biscopea

Phase 3: This small, circular organ is inserted into the chest cavity and releases hormones that vastly increase muscle growth throughout the marine's body. It also serves to form the hormonal basis for many of the later implants.

Haemastamen

Phase 4: Implanted into the main circulatory system, this tiny implant not only increases the haemoglobin content of the subject's blood, making it more efficient at carrying oxygen around the body and making the subject's blood a bright red, it also serves to monitor and control the actions of the phase 2 and phase 3 implants.
Larraman's Organ
Phase 5: A liver-shaped organ about the size of a golf-ball, this implant is placed within the chest cavity and connected to the circulatory system. It generates and controls 'Larraman cells' which are released into the blood stream if the recipient is wounded. They attach themselves to leucocytes in the blood and are carried to the site of the wound, where upon contact with air they form a near instant patch of scar tissue, sealing any wounds the Space Marine may suffer.
Catalepsean Node
Phase 6: Implanted into the back of the brain, this pea-sized organ influences the circadian rhythms of sleep and the body's response to sleep deprivation. If deprived of sleep, the catalepsean node cuts in. The node allows a Marine to sleep and remain awake at the same time by switching off areas of his brain sequentially. This process cannot replace sleep entirely, but increases the Marines survivability by allowing perception of the environment while resting. This means that a Space Marine needs no more than 4 hours of sleep a day, and can potentially go for 2 weeks without any sleep at all.

Preomnor

Phase 7: This is essentially a pre-stomach that can neutralise otherwise poisonous or indigestible foods. No actual digestion takes place in the preomnor, as it acts as a decontamination chamber placed before the natural stomach in the body's system and can be isolated from the rest of the digestive tract in order to contain particularly troublesome intake.

Omophagea

Phase 8: This implant allows a Space Marine to 'learn by eating'. It is situated in the spinal cord but is actually part of the brain. Four nerve bundles are implanted connecting the spine and the stomach wall. Able to 'read' or absorb genetic material consumed by the marine, the omophagea transmits the gained information to the Marine's brain as a set of memories or experiences. It is the presence of this organ which has led to the various flesh-eating and blood-drinking rituals for which the Astartes are famous, as well as giving names to chapters such as the Blood Drinkers and Flesh Tearers. Over time, mutations in this implant have given some chapters unnatural craving for blood or flesh.

Multi-lung

Phase 9: This additional lung activates when a Space Marine needs to breathe in low-oxygen or poisoned atmospheres, and even water. The natural lungs are closed off by a sphincter muscle associated with the multi-lung and the implanted organ takes over breathing operations. It has highly efficient toxin dispersal systems.
Occulobe
Phase 10: This implant sits at the base of the brain, and provides hormonal and genetic stimuli which enable a Marine's eyes to respond to optic-therapy. This in turn allows the Apothecaries to make adjustments to the growth patterns of the eye and the light-receptive retinal cells - the result being that Space Marines have far superior vision to normal humans, and can see in low-light conditions almost as well as in daylight.

Lyman's Ear

Phase 11: Not only does this implant make a Space Marine immune from dizziness or motion sickness but also allows Space Marines to consciously filter out and enhance certain sounds. The Lyman's Ear completely replaces a Marine's original ear. It is externally indistinguishable from a normal human ear.

Sus-an Membrane

Phase 12: Initially implanted above the brain, this membrane eventually merges with the recipient's entire brain. Ineffective without follow-up chemical therapy and training, but with sufficient training a Space Marine can use this implant to enter a state of suspended animation, consciously or as an automatic reaction to extreme trauma, keeping the Marine alive for years, even if he has suffered otherwise mortal wounds. Only the appropriate chemical therapy or auto-suggestion can revive a Marine from this state. The longest recorded period spent in suspended animation was undertaken by Brother Silas Err of the Dark Angels, who was revived after 567 years.

Melanchromic Organ

Phase 13: This implant controls the amount of melanin in a Marine's skin. Exposure to high levels of sunlight will result in the Marine's skin darkening to compensate. It also protects the Marine from other forms of radiation.

Oolitic Kidney

Phase 14: In conjunction with the secondary heart this implant allows a Space Marine to filter his blood very quickly, rendering him immune to most poisons. This action comes at a price, however, as this emergency detoxification usually renders the Marine unconscious while his blood is circulated at high speed. The organ's everyday function is to monitor the entire circulatory system and allow other organs to function effectively.

Neuroglottis

Phase 15: This enhances a Space Marine's sense of taste to such a high degree that he can identify many common chemicals by taste alone. A Marine can even track down his target by taste.

Mucranoid

Phase 16: This implant allows a Space Marine to sweat a substance that coats the skin and offers resistance to extreme heat and cold and can even provide some protection for the marine in a vacuum. This can only be activated by outside treatment, and is common when Space Marines are expected to be fighting in vacuum.

Betcher's Gland

Phase 17: Consists of two identical glands, implanted either into the lower lip, alongside the salivary glands or into the hard palette. The gland works in a similar way to the poison gland of venomous reptiles by synthesizing and storing deadly poison, which the Marines themselves are immune to due to the gland's presence. This allows a Space Marine to spit a blinding contact poison. The poison is also corrosive and can even burn away strong metals given sufficient time.

Progenoids

Phase 18: There are two of these glands, one situated in the neck and the other within the chest cavity. These glands are vitally important and represent the future of the Chapter, as the only way new gene-seed can be produced is by reproducing it within the bodies of the Marines themselves. This is the implant's only purpose. The glands absorb genetic material from the other implanted organs. When they have matured each gland will have developed a single gene-seed corresponding to each of the zygotes which have been implanted into the Marine.
These take time (5 years in the first case, 10 in the latter) to mature into gene-seed. The gene-seed can then be extracted and used to create more Space Marines.

Black Carapace

Phase 19: The most distinctive implant, it resembles a film of black plastic that is implanted directly beneath the skin of the Marine's torso in sheets. It hardens on the outside and sends invasive neural bundles into the Marine's body. After the organ has matured the recipient is then fitted with neural sensors and interface points cut into the carapace's surface. This allows a Space Marine to interface directly with his Power Armour.

Measuring Distance:

Errant bullets from the greenskins’ chain guns and solid-shot cannons chipped at the rock wall. A shard spanged against Dak’ir’s pauldron but he barely felt it. The spatial display on his right helmet lens told him the orks were just three hundred and sixty-five point three metres away.

-Salamander Page 329

Auto-Senses:

Like powered armour the suit's helmet contains its combat system. Referred to as auto-senses, features include thought-activated comms-link, bio-status readouts, full diagnostic and self repair functions, microphone, amplifiers, ear-protectors and an auto-reactive photochromatic visor to prevent the dazzling effect of sudden bright lights. Once plugged into his suit (a long procedure which requires the aid of several tech-adepts), the suit's visor also displays tactical information such as maps, way-point markers, compass, target recognition friend or foe and range-finder information and gives access to all the suits systems.

-Imperial Armour Vol 4 Page 15 (The Anphelion Project)

Targeting System:

He turned and emptied the last of his clip, auto targetters skipping from one head to the next.
-Blood Gorgon's Page 115

Environmental Scanning:

Barsabbas checked he had a full load in his sickle pattern bolter clip. His helmet HUD powered up, its ocular targeting syncing with his bolter sights. Slabs of system reports scrolled by his peripheral vision: climate, energy readouts, atmospheric toxicity, all of which Barsabbas ignored as the alarms brayed and amber cabin lights flashed.

-Blood Gorgon's Page 49

Vision Modes:

As a matter of automatic reaction, the Blood Gorgons switched to thermal vision. Nothing. Night reflection. Nothing. Multilight overlay. Nothing. It was an unnatural darkness flooding in from the warp.
-Blood Gorgon's Page 101

Heavy Resistance To Pressure:

With his helmet fixed on, a Space Marine in full power armour could survive in hard vacuum of space almost indefinitely.

-Dawn Of War II Page 155

Almost Completely Invisible To Heat Detection:

Ripping a man in half effortlessly:

One of the Isstvanian soldiers ran at him, shrieking and aflame, and pulled Temeter into an embrace. The captain let the flamer drop from his grip and ripped the man in two, tearing him apart effortlessly. He beat out the flames and grimaced as the rest of his troop waded in and finished the task.

-The Flight of the Eisenstein p.250

Not even straining to lift half a ton:

During a particular training exercise in ambush methods, a fledgling Disciple was crushed by his own poorly-rigged log trap. One of the four - Gabre - simply levered the half-tonne log off the dead man and Mautista saw with his own eyes the way Gabre barely strained to lift it.

-Flesh and Iron Page 118

Leaping 4 meters into the air from a standing position:

He leapt. His explosiveness was incredible, clearing four metres from a standstill.

-Blood Gorgon's Page 69

Capable of lifting 2.7 tons when not under duress:

"starting" Marine can carry 1,350 kg, lift 2,700 kg, and push 5,400 kg."

-Deathwatch RPG, Page 208

A Marine cracking Ceramite with his fists:

Loken threw a punch that would have decapitated a mortal man. His fist cracked against Jubal’s helm and he repeated the action, driving his fist four or five times against the other’s face and chest. The ceramite visor chipped. Another punch, his full weight behind it, and Jubal stumbled. Each stroke of Loken’s fist resounded like a smith’s hammer in the echoing chamber, steel against steel.

-Horus Rising Page 281

A simple back hand from a Marine shatters bones and sends the opponent flying:

Ragnar smiled and casually backhanded his attacker. Teeth flew everywhere and bones broke as his foe was thrown across the room.

-Wolfbane Page 127

Decapitation via a simple backhand:

Before the Imperial could shoot again, Kroeger was upon him, backhanding his fist across his face and decapitating him in an explosion of blood and bone.

-Storm Of Iron Page 17

Yet another backhand (Marines seem to like slapping people) sending 440lb flying with a swipe:

Laughing, Sica backhanded one of the hooded men with the ridged knuckles of his gauntlet, snapping his neck and throwing two hundred kilos of brutish soldier back into his comrades.

-Blood Gorgon's Page 64

Marines tearing open tanks:

Tanks did not slow the Space Marines down. They clambered up on to them, ripped off durasteel hatches as if they were made of paper and dropped grenades into the interior.

-Angel Of Fire

Speculated that with power armor a Marine should be able to support a building:

They were destructive, the firepower at their immediate disposal able to flatten urban blocks. With his bare hands, gloved in ceramite, he could crush and pry open sheets of metal, maybe even the support girders of a building.

-Blood Gorgon's Page 45

A Space Marine's speed is such that it induces a effect called Transhuman dread where the human brain cannot process the speed they move at:

Transhuman dread. Aximand had heard iterators talk of the condition. He’d heard descriptions of it from regular Army officers too. The sight of an Adeptus Astartes was one thing: taller and broader than a man could ever be, armoured like a demigod. The singularity of purpose was self-evident. An Adeptus Astartes was designed to fight and kill anything that didn’t annihilate it first. If you saw an Adeptus Astartes, you knew you were in trouble. The appearance alone cowed you with fear.
But to see one move. Apparently that was the real thing. Nothing human-shaped should be so fast, so lithe, so powerful, especially not anything in excess of two metres tall and carrying more armour than four normal men could lift. The sight of an Adeptus Astartes was one thing, but the moving fact of one was quite another. The psychologists called it transhuman dread. It froze a man, stuck him to the ground, caused his mind to lock up, made him lose control of bladder and bowel. Something huge and warlike gave pause: something huge and warlike and moving with the speed of a striking snake, that was when you knew that gods moved amongst men, and that there existed a scale of strength and speed beyond anything mortal, and that you were about to die and, if you were really lucking, there might be just enough time to piss yourself first.

-Age Of Darkness Page 163

Covering a dozen meters every pace:

“'Disperse!' bellowed Astelan, sprinting to his right. His power armour took him across the ground in huge leaps, covering half a dozen metres with every pace.

-Tales Of Heresy Page 304

Deflecting 3 bullets with a sword:

Slapping bullets out of the air:

“Plague Marines shot at him. Those shots that Gammadin did not slap out of the air, he took against his shoulder plates. Shrapnel puffed against him.”

Blood Gorgons, p.159

Deflecting a bullet with a combat knife:

Combat reflexes took over and Rafen drew his bolt pistol in a fraction of a second, his other hand snatching at the hilt of the battle knife resting in a sheath along the line of his spine. He fired a single shot at the High Chaplain, aiming low, aiming to wound, to slow him down. But he might well have called out his intentions in a shout. Astorath swept his blade aside and intercepted the bolt mid-flight with a crack of sound, the round blasting harmlessly into the dirt. Rafen dodged to one side as the weapon’s fast, fluid arc bisected the space where he had been standing, and he rolled, tumbling over red dirt and half-buried rocks.

-Hammer and Bolter. Redeemed Page 231-232

Slapping a bullet aside fired from point-blank range:

Space Marines are capable of following bullets with their eyes:

Gabriel squeezed a couple of shells out of his bolter and watched the little contrails that poured out behind them, as though in slow motion. They spun through the thick, gaseous air and then slipped through a gap in the lava flow, punching into the kaleidoscope of reflections beyond.

- Dawn Of War Omnibus Page 258

Microsecond reaction speed:

As the shell seared past, Rangar threw himself flat behind the low pile of rubble trying to make himself as small a target as possible. That had been close, too close. The shot had almost parted his hair. Only his lightning quick reflexes, and the microsecond's warning provided by his superhuman senses had got him out of the way. If he had ducked half a heartbeat later, his head would have been an exploding fountain of gore and bone.

- Space Wolf Omnibus Page 269

A Marine moving so fast it looked as if he had stopped the flow of time and inserted himself into the frame. Before proceeding to butcher a group of enemies in 3 seconds:

They came out from behind the trees around her, two, then three, then five, all told: five primuls in a circle around her, their eyes like murder for what she had done to their kin.
They threw themselves at her.
For many years afterwards, for the rest of her life, in fact, Perdet Suiton Antoni often wondered how none of them heard him coming. He was just there, suddenly. How could something that big move so fast and so silently, and appear without notice? Between the moment when the primuls began to spring and the moment when they would have fallen upon her, the giant appeared and interposed himself between her and the foul, pouncing creatures. It was almost as if he had stopped the flow of time and edited himself into that particular frame of it.
What followed lasted about three seconds.
The giant had his combat shield locked on his left arm and his short, heavy sword in his right fist. As he arrived, he was swinging the shield out, and smashed it flat into the nearest, leaping primul, shattering bones and deflecting the thing away. Wheeling, he hacked his sword clean through the neck and shoulder of the second, casting out a shower of dark red blood, and then ripped backwards low, cutting through the corpse's thighs even as it toppled, so that the whole mass of the primul folded into a collapsed heap. The third, coming in at the giant's left flank, held some kind of pistol weapon, an ugly, spiky device that spat hard, sharp bullets of buzzing metal. The giant turned, raising his left forearm upright from the elbow, and guarded his face with the combat shield in time to switch the buzzing projectiles away. They struck the shield with loud, angry cracks. One embedded itself there. Another bounced off and decapitated a nearby sapling. As the third bullet hit, the giant deftly tilted his arm very slightly, and ricocheted it off sideways straight into the face of the fourth primul. The creature's head split like a blood-fruit and the primul was savagely thumped backwards, off the ground, its legs wide. It landed, spread-eagled, on its back.
Before the third primul could fire its pistol again, the giant whipped his right arm over and threw his sword like a lance. It struck the primul through the chest, lifting it off its feet with the force of the throw, and impaled it to an olive tree's trunk, its feet dangling and twitching.

The remaining primul, wicked blades in both hands, was dancing round behind the giant. With his free right hand, the giant grabbed the heavy firearm that had been knocking at his hip on its long strap, and shot the primul twice, in the face and the chest. The double boom of the massive gun was so loud it made Antoni cry out and cover her ears. The force of the shots tore the primul apart, and slammed its mangled body across the grove. It bounced sideways off a tree trunk and fell into the bracken. Silence, except for the gurgle of leaking blood.

-Brothers Of the Snake Page 62-65

It takes a Marine a Nanosecond to process how to deal with an opponent:

The Word Bearer is almost unrecognisable. For a nanosecond, the figure registers to Luciel as an unknown, a threat.

Transhuman responses are already there, unbidden. Adrenaline spikes to heighten an already formidable reaction time. Muscle remembers. Luciel wears his boltgun, an oiled black pit bull of a weapon, in his thigh holster. He can draw, aim and fire in less than a second. The range is six metres, the target unobstructed. There is no chance of missing. Maximus plate, frontally augmented, might stop a mass-reactive shell, so Luciel will fire two and aim for the visor slits. The airgate skin-sleeve is self-repairing, and will survive las-fire damage, but a bolter shot will shred it open, so Luciel also braces for the explosive decompression of a ricochet or a miss-hit. At a simple, subconscious neural urge, boot-sole electromagnets charge to clamp onto the deck plates.

He can make a clean kill headshot in less than a second and a half, two rounds for kill insurance, and probably protect the atmospheric integrity of the airgate.

All this, all this decided, unbidden, instinctive, in less than a nanosecond.

-Dawn Of War Omnibus Page 258

Tied up and with no armor a Space Marine curbstomps Imperial Guardsman despite the fact he was only playing with them:

Before they could finish their initial screams of surprise, Barsabbas swept his forearm and pinned the closest against the wall, crushing his spine. The rest backed away, yelling loud, panicked words. One of them began to fumble with a lasrifle, but he was unfamiliar with it beyond ceremonial purpose. He attempted to fire on Barsabbas with the safety still caught. Like a great fish breaking the surface, Barsabbas tossed a sentry away and flung him down the corridor. Hastily lashed shock mauls bounced off his unyielding hide. The remaining three men were tossed about like bushels of grain. Each surge of Barsabbas’s steel bound limbs threw them from wall to wall, bouncing them, breaking them. The Blood Gorgon was simply playing with them

-Blood Gorgons Page 153

Kills 4 opponents with nothing but a combat knife in under 3 seconds:

The first guard died without a sound, Uriel’s knife hammering through the base of his skull. He dropped and Uriel wrenched the blade clear, spinning low and driving it into the second guard’s groin. Blood sprayed and the man shrieked in horrified agony. A lasgun was raised and Uriel lunged forward, smashing his fist into the foe’s face, the augmented muscles of his power armor smashing the man’s head into shards. Uriel spun on his heel, dodging a thrusting bayonet, and thundering his elbow into the last guard’s chin, taking the base of his skull off. Teeth and blood splattered the bunker door.
He dropped into a defensive crouch, dragging his knife clear of the corpse beside him and cleaning the blade on its overalls. The killing of the guards had taken less than three seconds.

-Ultramarines Omnibus Page 3

A Choas Marine easily takes out a group of Dark Eldar without the use of weapons (Dark Eldar are faster than Space Marines):

As Hepshah struggled to regain his breath, the Chaos Space Marine gripped him firmly by the face, pinning his head with a delicate grip. His other hand darted, whisper quick, tapping him on the temple with a longmace. No more than a light double tap. Hepshah stopped struggling. The dark eldar was no longer recognisable from the neck up. The encounter took just seconds and by the time Hepshah’s body was discovered, Barsabbas was already gone.
Moribeth found Draaz hung from the rafters. She found Fhaisor and Amul Teth reclining behind a bombed out dust buggy. In the open, tossed amongst the debris, was a stove boiler that leaked blood. She did not open the coal hatch, but presumed it to contain the remains of Sabhira. She did not feel fear – only indignity. Snarling, she stalked through the ruins. Occasionally she stopped to crack her whip meaningfully, with a belligerent pop. It was a declaratory snap and most knew to run when they heard it.
‘You can’t hide from me,’ she sang. She had always been the predator. Ever since her young maiden years, Moribeth had accompanied her cousins on slave raids. This was second nature to her. In her free hand, hidden behind her back, was a neural blade gifted to her by her kabal’s mistress. The poison it secreted overloaded the pain nerves in living creatures. She pitied anything that crossed her path.
‘Come out, come out,’ she cooed.
‘Here I am.’ The voice sounded like slabs of rockcrete grinding together. A shadow fell across her. Moribeth turned and her confidence dissipated. She slashed her neural whip low, but the tip snapped listlessly as it connected with ceramite. With a speed that surprised her, the horned warrior slapped the top of her head with his palm. There was a pop as her spine compressed and vertebrae slipped out of joint. Moribeth died still believing herself a predator.
‘Face me!’ Vhaal howled, raising his arms into the air in challenge. A muzzle flashed in the distance. Low and muffled. The bolter’s bark. Vhaal, second son of the kabal, fell unceremoniously through a screen paper window, his feet stiffening awkwardly in the air. He was already dead before he landed, felled by a single shot.
The monkeigh warrior appeared indifferent to his threats. He walked into and through the caprid fence that separated them, splintering the wood with his shins and thighs.
‘Catch me to kill me!’ Sindul spat. He leapt up against the sheer rock wall behind him, limbs splayed against the surface, and began to scarper up the vertical drop. He used his lacerator gloves, dragging the hooked claws of his fists for purchase. He shot up the wall like a rodent, scaling twelve metres in a matter of seconds before bounding backwards into the air. A bolter round missed him as he leapt. He landed behind the monkeigh, slashing his lacerators as he sailed overhead. But the horned warrior was faster than Sindul had estimated. It was a grave error. The monkeigh spun with practiced fluidity, pouncing with all the weight and drive of a quarter tonne primate. Sindul rolled aside, but not fast enough. The monkeigh snagged him with its paw and dragged him to the ground by his ankles. Sindul tried to regain his gyroscopic balance, but his thin ankle was locked in a hammer grip of ceramite.
‘I don’t need to kill you yet,’ growled the Traitor Marine as Sindul thrashed like a hooked fish. Dragging his splinter pistol free from its chest holster, the dark eldar began to fire. The first shot hammered a toxic splinter into heavy chest plate. The monkeigh dodged the second with a little dip of his head.
‘Stop, now.’ With that, the monkeigh backhanded him with steel-bound hands. Sindul’s head snapped violently off to the right and he blacked out.

- Blood Gorgons Page 75-76

A Marine assesses the weakness's of 6 soldiers in only a few heartbeats:

His battle-hardened mind assessed the relative strengths and weakness of the six soldiers without conscious thought: armament, distance, levels of combat effectiveness, routes of attack and escape calculated in less than a few panicked beatings of their hearts.

-Imperial Armor Vol 9 Page 46

Shows how fast a Marine's mind can work. Not to mention states that twenty thousand men would be little more than a speed for a company of Marines (about 1k Marines thats 20 to 1 odds):

Barsabbas counted the numbers with a cursory auspex sweep. He calculated the readout in his head, subtracting an estimation of noncombatant families and livestock signatures. The total, even with a generous estimate, would be no more than twenty thousand fighters. Twenty thousand men would amount to little more than a speed bump against a well drilled company of Chaos Space Marines.

-Blood Gorgons Page 95

Demonstrating the Laraman Organ's Healing Factor:

Red runes winked into life on his visor as his armor was torn open in half a dozen places. He felt searing pain and cursed as he yanked a plate-sized piece of sizzling shrapnel from his leg. Almost instantly, he could feel the Larraman cells clotting his blood and forming a protective layer of scar tissue over the wound. He had suffered much worse before and shut out the pain.

Ultramarines Omnibus Page 22

A Grenade is little more than an annoyance:

They laughed as they worked, a drywicked laughter that was frightening in its intensity. From behind the circular saws of an industrial rockcutter, a hooded man lobbed a rock at Sica. He heard a whistling sound and he turned the slab of his shoulder pad towards the missile. There was a flash of light. Even with his eyes closed, Sica’s vision strobed red and bright yellow. It had been a grenade. The explosion pushed Sica slightly and made him grunt with annoyance at his own carelessness. He shot the man off the industrial saw, quickly, as if ashamed.

-Blood Gorgons Page 63

Takes re-entry and a crash land to earth with hardly any discomfort:

Barsabbas almost did not feel the crash. The drop pod collided with the planet’s surface at high speed and continued to bounce with a loose, jarring expulsion of force. The impact would have shattered any normal human’s skeletal structure.

- Blood Gorgons Page 49

Ferrocrete (metal concrete hybrid) breaks before Space Marine bones:

The Assault Marines bounded down the ramp, jump packs flaring. In pairs they threw themselves from the gunship's open prow. Boreas tracked their descent on the external pict-feeds, watching the ten Space Marines plunge to the ground, their jump packs slowing their descent. With impacts that would have shattered the bones of lesser warriors, Zaltys's squad landed in the compound, ferrocrete cracking beneath their booted feet.

- Purging Of Kadillus Page 226

Flame throwers have no effect:

From somewhere a flamer unleashed a blaze of burning promethium, a gush of flaming orange liquid washed over him, but encased inside his armour he barely felt the intense heat.

-Imperial Armor Vol 7 Page 79

Thanks to their healing factors this is how Space Marines grade minor injuries:

Other more minor injuries — severed hands, gouged eyes, punctured lungs — appeared more frequently.

- Salamander Page 340

Thanks to their healing factor a missing limb only serves to annoy them:

As another melta-bomb was slammed into place by a warrior of the 217th coterie, the champion Namar-sin staggered into the protection beneath the gateway, smoking bullet craters across his armour. His left arm was gone, blown clear by autocannon fire, and his armour was awash with blood.

Brother Namar-sin was at Marduk's side, and he buried his axe in the chest of another of the soldiers, the pain of his severed arm lending him additional strength and fervor.

Dark Disciple Page 28-30

Shrugging of lighting that was destroying the area around them hitting with the force of Predator Missles:

We’re exposed out here,’ Bulle muttered. ‘Let’s get back into the forest.’Tarvitz was amused. Bulle made it sound as if the stalk thickets were safe ground.Giant forks of lightning, savage and yellow-white phosphorescent, were searing down into the open space, explosively scorching the earth. Though each fork only existed for a nanosecond, they seemed solid and real, like fundamental, physical structures, like up turned, thorny trees. Three Astartes, including Lucius, were struck. Secure in their Mark IV plate, they shrugged off the massive,detonating impacts and laughed as aftershock electrical blooms crackled like garlands of blue wire around their armour for a few seconds.

The storm above grew still more ferocious. Five more men were struck. One of them, Ulzoras, was actually knocked off his feet. They saw fused, glassy craters in the ground where lighting had earthed with the force of penetrator missiles.

-Horus Rising Page 232

A Marine buried under thousands of tons of earth stays under for days before digging his way out:

A Marine takes a 3 story fall without a scratch:

Taking fire from a Heavy Bolter and not breaking through armor durability:

“Kohl and Ephrial exchanged fire with them, dropping several with well-aimed shots. A burst of heavy bolter fire answered them, stitching the two Astartes with a stream of shells. Both warriors staggered beneath the hits, but their armour turned aside the blows.”

Pg.411 FA

Said Heavy Bolter was capable of punching through an APC:

“”Brother Vardus opened fire a second later, raking the rear Testudo with an extended burst of heavy bolter fire. The mass-reactive rounds exploded against the APC’s armoured hide and gouged craters in its solid tyres. Here and there the rounds found a seam in the armour plates and penetrated into the APC, wreaking bloody havoc on the men crammed within. The Testudo lurched to a stop, smoke pouring from the holes punched in its side.”

Pg.165 FA

Takes shots from enemy gun-ships (who have big-a$$ guns):

Heavy autocannon fire sprayed the roof of the building, churning up its pebbled surface and shredding human flesh. The men who had been awaiting rescue in the flyers were the first to die, ripped apart in seconds by the heavy calibre, armour piercing shells. Vedden screamed as an autocannon shell clipped him, instantly shearing his leg from his body in midthigh. He collapsed, dragging the girl to the ground with him.
The Ultramarines scattered, firing at the ornithopters, but their bolter rounds were ineffective against the armoured undersides of the gunships.
Learchus sprinted forward, diving to the ground to gather the girl in his arms and rolling on top of her as the ornithopter's shells ripped towards her. He supported his weight on his elbows so as not to crush the girl and felt the powerful impacts hammer into his backplate. He offered a small prayer of thanks to his armour for standing firm against the traitorous fire.

-Nightbringer Page 161

Space Marines can steal memories by biting. Taking a bite out of an enemy gives them the enemy's memories and combat experience:

Barsabbas sighed wearily. First, he and Sargaulres wore their oaths of brotherhood. The Astartes implant known as the omophagea allowed for learning by eating. Through the implant they were able to ‘read’ or absorb genetic material that they consumed, the omophagea transmitting the gained information to the brain as a set of memories or experiences. The Blood Gorgons remembered a time when they had fought against one another. Although they had always been one Chapter, the Reforging was part of their Chapter history. The oaths reminded them of this, or so the veterans said. Barsabbas could not remember the Reforging. That was before his time and no more than a curious relic of history.

- Blood Gorgons Page 44

A Marine shows resistance to mind attacks:

Uriel fought against the pulsing waves of violence that crashed against his mind, gripping his chainsword tight. From up ahead he could hear the screaming of the damned and he steeled himself for the coming confrontation. Barzano ran beside him, pale and drawn. The wailing screams from up ahead tore into Uriel’s mind, feeding the evil that pounded relentlessly on his thoughts.

He could feel that the chamber beyond was the source of the evil in his head and a miasma of gritty darkness filled the air within.Uriel charged into the pyramid-chamber of the Nightbringer, to find a scene of utter bedlam. PDF troopers convulsed on the chamber floor, faces bloody where nails and fingers had ripped eyes from their heads. Those men still conscious beat themselves bloody with broken fists, mewling in terror at nightmares only they could see.

-Ultramarines Omnibus Page 256

Space Marines are almost completely immune to poisons. In fact if they are poisoned their body stores it in their body so they can use it against their enemy later:

The primul lord kept the claw pinned hard with his spear, one handed, as he drew out a bite-dagger to finish Priad off. The twinned blade rose up.
In the final second, Priad remembered his benediction. He was still envenomed from that lucky omen on the Cydides Isthmus. He was a striking snake. He tensed the Betcher's glands in his hard palette, where the green-back viper's toxins had been contained, and spat into the primul lord's eyes.
The primul screamed and fell back, clawing at his mask.

-Brothers Of The Snake Page 408

Space Marines are capable of digesting almost any including the consumption of iron girders:

One of his implants, the preomnor, was a predigestive stomach capable of processing a wide variety of poisonous or otherwise indigestible material – if he so chose, Aramus could consume and digest the scaffolding and the cushions and all, without any concern but that he might receive a few splinters along the way. And if a Space Marine should happen to ingest something that the preomnor was incapable of processing, the neuroglottis implanted at the back of his mouth would allow him to detect the fact in time for him to spit it out before swallowing any of it

- Dawn Of War II Page 94

A Space Marine's gene-seed (the thing that holds a Marines genetic information) can be modified to give extra benefits depending on the Chapter. For example the Soul Drinkers can learn to think and act like the enemy by consuming them:

Due to the Soul Drinkers’ gene-seed the omophagea, the organ implanted in every novice during his conversion to a Space Marine, was different to that of most other Chapters. Its purpose was to absorb racial memories and psycho-genetic traces from ingested organic matter – allowing the Marine to gain intelligence on how to use the enemy’s weapons, into their beliefs and morale, sometimes even battle plans and troop locations. The Soul Drinkers’ omophagea was overactive compared to those of other Marines, delivering an experience both more intense and less precise. It was one of the cornerstones of the Soul Drinkers’ beliefs that they could experience the thoughts and feelings of their enemies and come out sane and uncorrupted, furnished as much with disdain for their inhumanity as with knowledge of their behavior.

-Soul Drinkers Page 15

The World Eaters also have modified gene-seed that enhances their aggression and automatically blood-lusts them in combat rendering them nigh-uncontrollable:

Because we couldn't be trusted. The Emperor needed a weapon that would never obey its own desires before those of the Imperium. He needed a weapon that would never bite the hand that feeds. The World Eaters were not that weapon. We've all drawn blades purely for the sake of shedding blood, and we've felt the exultation of winning a war that never even needed to happen. We are not tame, reliable pets that the Emperor needed. The Wolves obey, when we would not. The Wolves can be trusted, when we never could. They have a discipline we lack, because their passions are not aflame with Butcher's Nails buzzing in the back of their skulls.
The Wolves will always come to heel when called. In that regard, it is a mystery why they name themselves wolves. They are tame, collared by the Emperor, obeying his every whim. But a wolf doesn't behave that way. Only a dog does.
The moment we realized that truth, we changed our Legion's name. That is why we are the Eaters of Worlds, and the War Hounds no longer.

-Captain Kharn (The Betrayer) of the 8th Legion

A Terminator punches through a meter of reinforced metal:

My fist hits the iron door with a crack of thunder. The impact shatters the emerald scales of the hydra that rears across their width. Inside my Terminator armour, enfolded in adamantium and ceramite, I feel the blow jolt through my thin flesh. Lightning crackles around my fist as I pull it back, the armour giving me strength. I bring my fist down and the meter-thick doors fall in a shower of splintered metal. I walk through their shattered remains, my feet crushing the scattered ruby eyes of the hydra to red dust on the stone floor.

- Hammer And Bolter #10 Page 24

A Terminator punches someone w/power fist and it sends the enemy so far that the Terminator can no longer see him:

Demosthor drew back his power fist and punched the Iron Warrior with such strength he was thrown clear out of sight by the impact.

- Endeavor Of Will Page 33

A Terminator uses a 6ton door as a weapon:

It took Praetor three blows from his thunder hammer to batter the bulkhead door down and send it screeching from its moorings into the corridor at speed. Like most sons of Vulkan, his strength was prodigious, but even among the Fire-born Praetor had a reputation for incredible feats. Brought on by fury and determination, this one ranked as one of the toughest.
The closest Raptor didn't see it coming. Six thousand kilograms of half-metre-thick metal took the renegade down, slamming into its torso and nearly cutting it in two.

- Fear The Alien Page 146

The biggest feat of durability for Terminator armour. A Terminator gets stepped on by an Imperial Titan. To put it into perspective the single limb from a Titan can weigh up-wards of 100tons. Here's a picture of a Titan for reference:

As you can see these things a fricking massive!

Terminator stepped on by a Titan and survives:

Egil racked the slide on his bolter as the ground shook under a thunderous impact. The deep, rumbling crash sounded again, like an angry god's footsteps and...emerging from the smoke, like a vast beast from the sagas, a Night Gaunt Titan towered above them.
...
The gigantic war machine's foot smashed aside buildings in its path and Egil realised with sick horror exactly where it would stamp down.
...
He landed badly and cursed as he fell to the rubble, looking back to see Kaarlson (the one wearing the Terminator) slowly lumbering through the ruins. He (Egil) screamed his name as the mass of the Titan's foot smashed through the building and crashed down upon the Wolf Guard Terminator.
...
Egil looked over towards the flattened building and watched with astonishment as the rubble began to shift and heave. Massive chunks of plascrete and steel were pushed aside as Kaarlson pulled himself free from the debris. His Terminator armour had been gashed open in a dozen different places and his blood was splashed crimson against its grey but he was alive.

- Index Astrates

A Terminator is shot with a flamethrower in order to burn the enemies off him:

Honorious bathed the sergeant of the Firedrakes with his flamer, burning the diminutive greenskins off him like they were an infestation.

- Salamander Page 361

Terminator Armour takes a shot from a Plasma weapon (a gun that hits with the same temperature as the sun):

A bright flash of plasma burst from the trees and hit Karraidin square in the abdomen. The superheated liquid plasma ate through his abdominal plate and pushed Karraidin backwards, his armoured boots digging into the rock beneath him. But Karraidin did not fall—with awesome strength he held his ground, and when the flare of the plasma blast died down there was a great crater melted in the armour covering his stomach. Amid the metallic stink of vaporised metal, Sarpedon could smell cooked flesh.

- Chapter War Page 76

Plasma Weapons:

Plasma weapons utilize the same technology as found in plasma reactors and drives: hydrogen fuel is held suspended in a photonic state, typically in a sturdy flask or backpack container, before being fed into the weapon's miniature fusion core and energized into a plasma state. This plasma is then contained by powerful magnetic fields until the weapon is fired, whereupon it is ejected via a linear magnetic accelerator to form a bolt of superheated matter in appearance and temperature much like a solar flare (giving rise to the nickname "sun gun"). Upon impact tremendous energy is released akin to a small sun, destroying the target through searing heat and explosive shock in an almighty explosion.

This technology has been harnessed into weapons as small as a pistol into weapons as huge as cannons. They are one of the most dangerous hand-held weapons in the 40k-verse as you are essentially carrying round a small sun that can be shot at the enemy.

Melta Weapons:

Melta Weapons are heat-based weapons which work by sub-atomic agitation of the air. Targets on the receiving end are heated to the point of being vaporized. The effect on flesh is fearsome to say the least, while vehicles can be reduced to molten slag. Most melta weapons use highly pressurized pyrum-petrol gases with a two part injection system which forces the gases into a molecular state, which will vaporize just about anything. Unfortunately, due to the high power consumption and range dissipation, the weapon is only effective over very short distances, but anything caught in the blast is likely to be destroyed.

This technology has also been harnessed into weapons as small as a pistol into weapons as huge as cannons.

Flamers:

Flame-throwers more commonly referred to as Flamers unleash a liquid incendiary chemical, usually promethium, that bursts into flame as it leaves the weapon. They are valued for their ability to destroy many enemies at once, regardless of any protective cover. Both flamers and the more compact hand flamers are considered assault weapons due to their relatively short range. The substance used as fuel for Imperial flamer weapons, a highly volatile incendiary gel which immediately ignites on contact with oxygen. It reaches super hot temperatures. Similar to napalm, the gel sticks to an individual, continuing to burn on its own accord, even underwater and in space. It also fuels most spacecraft and vehicles, both military and civilian.

This technology has also been harnessed into weapons as small as a pistol into weapons as huge as cannons.

Combi-Weapons:

Combi-Weapons as their name suggests are Hybrid weapons. These guns generally incorporate the standard Space Marine Bolter in conjunction with another weapon for example a plasma, melta or flamer this allows the Marine to seemlessly switch between firing a bolter to a plasma, melta or flamer any time he chooses.

This technology has also been harnessed into weapons as small as a pistol into weapons as huge as cannons.

Missile Launchers:

Some Space Marines choose to sacrifice a high-rate of fire from a weapon such as a bolter in favor for something that has a low rate of fire but also a very low survival rate for the enemy. Missile Launchers in 40k have many kinds of ammunition that ranges from your standard Krak Missile to biological attacks. Here's a list of the most common ammunition the Imperium uses in its Missile launchers:

• Frag Missiles are designed to explode on impact with any surface, raking the immediate area with lethal shrapnel. Primarily an anti-infantry weapon, it can be used against light vehicles with some success. Frag missiles are often ineffective against heavy infantry.
• Krak Missiles are primarily designed as anti-vehicle weapons, but are also very effective against heavy infantry, bunkers and other armored targets. Krak missiles contain a high strength, low blast shaped charge, causing massive damage to anything it hits with minimal collateral damage.
• Astartes Anti-Plant Missiles are a stronger variant of anti-plant missiles. They release a vicious cocktail of toxins, viral agents, defoliants, and anti-fungal agents on detonation that reduce even the heartiest flora to a foul-smelling muck in minutes. They are typically used to deny cover and to clear landing zones and fortification sites.
• Concussion Missiles are very effective at breaking up fortifications and are much beloved by the Battle-Brothers of the Imperial Fists garrisoned at Watch Station Erioch.
• Flakk Missiles are surface-to-air warheads designed to engage enemy air support.
• Other Types: missiles are extremely versatile and can potentially carry any conceivable type of payload. Examples include Anti-Plant, Virus, Vortex, Smoke, Gas, Tanglefoot, Haywire, Stasis, Plasma and Photon Flash.

Lascannons:

Lascannons are the most powerful weapons outside of Titan and Exterminatus weapons that the Imperium has to offer. These cannons are capable of one-shotting Tanks and Terminators.

Lascannons emit a highly focused, high energy beam of light which on impact produces a rapid temperature change on the target's surface, causing vaporisation in the form of a small explosion. The beam itself lasts for only a short duration, creating a searing flash of light and distinctive snap or crack sound as air is ionised. Energy for each shot is stored within a fast discharge generator, taking up most of the weapon's mechanism, and regulates the power of each beam to prevent overpowering and improve reliability.

These weapons however are very big and cumbersome. So much so that for normal human use they have to mounted onto tanks or tri-pods. Marines being far stronger than Humans can handled the massive recoil and weight.