Each one representing one of the Capital Cities of Heaven they are: The Fist, The Bride, The Daughter, The Cobra, The Dog, The Orphan, and the Crane. To determine the order and frequency that each city will appear on Earth, the Immortal Weapons fight in a single-elimination martial arts Tournament of the Heavenly Cities. The winner's city appears on Earth once every ten years while the champion who places last will have their city appear only once a century. The current Immortal Weapons are:
- Iron Fist: Danny Rand, 66th in the line of living weapons of the city of K'un-Lun.
- Bride of Nine Spiders: Her heart pumps the coldest blood imaginable, and horrors inconceivable to mortal men. The name of her City is unknown but the entrance lies in the Valley of Gates.
- Tiger's Beautiful Daughter: Many a man has found his doom at her hand, or in her bed. Her City is a tropical island.
- Fat Cobra: His size and strength are only outclassed by his speed. Cobra Warrior of Peng Lai Island.
- Dog Brother #1: Hero to all the strays on all the streets of the world, a prankster assassin who rules the Under City.
- Prince of Orphans: Mysterious, even to those who cultivate unending mystery. He is the oldest living Immortal Weapon having participated in a past Tournament of the Heavenly Cities. Hails from the jungle city of Z'Gambo.
- The Crane: Davos the Steel Serpent was known as the "Steel Phoenix" while serving as the honorary champion in the Tournament of the Heavenly Cities for the Mystical City of K'un-Zi, which had lacked an Immortal Weapon since Orson Randall killed the previous Crane and Crane Mother only gives birth to a new one once every 300 years. Since the tournament the title of The Crane has remained unfilled.
- Monkey King: A Hong Kong crime lord who stole the staff (and blessing) from Sun Wukong is technically the unofficial Immortal Weapon of the Forbidden Eighth City after he fought his way out and redeemed himself.
The Last Iron Fist Story and the Seven Capital Cities of Heaven
Orson Randall, who had been on the run for many years after accidentally killing another Immortal Weapon and fleeing the City of K'un-Lun with the Book of the Iron Fist, had resurfaced. Pursued by Davos and HYDRA, he sought Danny to teach him of his legacy and prepare him for the Tournament of the Heavenly Cities. Davos, working for the city of K'un Zi, wanted to restart the Tournament for his own purposes while Hydra, under the direction of Xao, wanted the tournament restarted so as to destroy all the Heavenly Cities at once. After a massive fight with the Steel Serpent, Orson sacrificed himself, but allows Danny to touch his heart and take his chi. Danny then rose to face the Steel Serpent as his equal. He was then able to match Davos, who fled, having completed his mission. Danny was then summoned back to K'un-Lun by his master Lei Kung the Thunderer for the Tournament.
The Tournament of the Heavenly Cities was a Kung Fu tournament that occurred every 88 years, and was held to determine which Mystical City of would appear on earth every decade. The order of the Tournament results would determine the frequency of appearance for each city, ranging from once every decade to once every century. Each city's Immortal Weapon was required to participate. During the Tournament, Danny met his six mystical counterparts, and after losing in the first round of the tournament he discovered a secret doorway between Earth and K'un L'un that allowed passage without the mystical connection every decade. This machine was created by Orson's father and was shown to Danny by Orson's illegitimate daughter. After using the machine to escape to Earth, Danny managed to locate Ernst Erskine, Orson's biographer, to learn more about the previous Iron Fist. He also discovered a resistance movement of women warriors, led by Lei Kung and Orson's unnamed daughter, devoted to bringing down the corrupt current Yu-Ti, Nu-An. At the same time, Hydra was attempting to breach the mystic barrier and destroy K'un L'un, led by Xao, using a magnetic train that Jeryn Hogarth, Danny Rand's lawyer and business counsel, had been forced to build for him. In a final battle involving all seven Immortal Weapons and Lei Kung's army against Xao and HYDRA, Iron Fist was able to destroy the train, defeat Xao, liberate K'un L'un from Nu-An's corruption and lead the Immortal Weapons out into Earth to learn about the world.
The Mortal Iron Fist
During the tournament, Danny also discovered that the root of his family's fortune was rooted in the blood and oppression of all Seven Capital Cities of Heaven. Danny decided to give all his money away and turned Rand International into the world's largest and most deeply funded not-for-profit organization. Because of these changes and his mother's kidnapping by HYDRA, Jeryn decided he should move on, despite respecting what Danny was trying to do. Meanwhile, the five Immortal Weapons Danny brought to Earth (Fat Cobra, Bride of Nine Spiders, Tiger's Beautiful Daughter, Dog Brother #1 and The Prince of Orphans) were investigating Xao's claim of an Eighth City.
Using his fortune, Danny has bought back the old Heroes For Hire building and started up a new ''Thunder dojo," as a place in for kids to come and learn Kung Fu, among other things, such eating and tutoring. Danny has also started driving around in a van named "Orson's Race", helping out homeless people. Then one day, while studying the Book of the Iron Fist, Danny noticed something. Every single Iron Fist, except Orson, has died at the age of 33. And right after that discovery, Luke, Colleen, and Misty entered the room, wishing him a Happy Birthday. A Happy 33rd Birthday.
Soon afterward is attacked by a servant of Ch'l-Lin, defeating easily. He claims that he has killed many Iron Fists. However, Luke, Misty, and Coleen arrive just as the servant prepares to slay . Luke manages to get a hold of the mysterious assassin, but he then suddenly vanishes. searches for answers in the Book of the Iron Fist to try to understand how Orson Randall was able avoid being slain by the Ch'l-Lin's assassin. However, one of 's new business associates calls up to alert him of the Ch'l-Lin Assassin staking out the Thunder Dojo.
Danny heads for the dojo, where he finds the assassin, whose real name has been revealed as Zhou Cheng. Having placed some sort of telepathic command upon the students to kill each other if does not surrender. bows before Cheng, but this is quickly revealed to be only a ploy, as Luke, Misty, and the other Immortal weapons arrive to aid . While still formidable in combat, correctly guessed that an opponent who was tailored to fight the Iron fist would not be as effective against the other weapons. The group defeats Cheng, but he vanishes into thin air.
The Immortal Weapons embark on a hunt for Cheng, while attempts to learn about his new adversary. He soon learns that Orson Randall was only able to escape Cheng by addicting himself to heroin, thus damping his chi and leaving Cheng under the assumption that he had died. While searching for a way to defeat Cheng in the Book of the Iron Fist, Iron Fist, discovers that his assistant, Nadine, is an accomplice to Cheng, after she poisons his coffee. While 's chi prevents the poison from killing him, it is sufficiently strong to weaken him significantly. All of a sudden, Cheng arrives in 's office, thanks Nadine (who, although being Cheng's "beloved," appears to have been a rather reluctant accomplice), and prepares to finish what he and Rand started. Just then, Nadine steps in and attempts to stop Cheng, revealing to him that she is pregnant with his child, and does not wish for their baby to be the child of a murderer. Cheng, is it revealed, is seeking the retrieve the heart of the Iron Fist in order to enter K'un Lun and devour the egg that births the next Shou-Lao the Undying every generation, thus wiping out K'un Lun's Iron Fist legacy. Despite having slain every previous Iron Fist who did not otherwise fall in battle or relinquish their power (excepting Orson Randall), Cheng has always failed to reach the egg.
Cheng, who it is also revealed has been slowly buying out Rand Int. over the past 20 years, throws the pregnant Nadine out of the way, and continues his attack. Danny has his shoulder dislocated during the battle, but manages to defeat Cheng even in his weakened state. Following the duel, the Immortal Weapons, Luke, Coleen, and Misty arrive, and reveal to that they have discovered a map in Cheng's apartment that leads to the Eighth City of Heaven, whose existence was mentioned by Xao during the tournament of the seven cities. Rand and the others realize that his is where the Ch'l-Lin originated.
Escape from the Eighth City
Before their departure, Davos arrives at the behest of Lei Kung to inform Rand that the Eighth city is, in fact, a prison constructed to hold demonic creatures that had once threatened K'un Lun and the other cities of Heaven and its gate only allows for passage in but not out, making it effectively synonymous with Hell. However, Davos also informs that the previous Yu-Ti had housed anyone who attempted to rebel against his rule in the Eighth city, and Lei Kung commissions Rand and the Immortal Weapons to rescue the wrongful prisoners, and informs them that the in-not-out rule can be bypassed by all six of the Immortal Weapons.
Upon arrival at the gates of the city, Rand and the others are literally sucked into the depths of the city, whereupon they are attacked by the prisoners of the Eighth city, which is ruled by the nefarious Changming, and forced to fight the demons of the city one by one, each time beaten nearly to death (their Chi weakened by having been pulled into the city) and rotated repeatedly, while being allowed to heal to just enough to be able to fight again. While is in his cell after a fight, he hears a tapping on his cell wall, and realizes it is being done in Chinese, with the message "You are an Iron Fist. Just like me." Meanwhile, it is revealed that Davos has not been honest with and the Immortal Weapons about their mission, as he has posted a spy outside of the gate of the Eight City, who reports there being "no signs of life," but that "something is clearly happening," and Davos determines that this requires him to battle once again.
Rand's fellow prisoner reveals himself to be Quan Yaozu, the very first Iron Fist. Quan reveals that in the early days of K'un Lun's history, Changming had risen to power during a time of moral decadence in the city. Changming had been the one who had originally summoned all of the demonic creatures that had once plagued K'un Lun into the city, including Shou-Lao the Undying, and used them to quickly conquer the city. One day, however, a lone warrior had entered the dragon's cave to challenge it.
Before Quan can finish, he and Rand are removed from their cells and brought into the arena for a fight. By now, Changming has learned that Rand and the Immortal Weapons have been formulating a plan to rescue the prisoners of the and make their escape, by leaving each other Morse code messages in the arena after each fight. Changming declares that Rand and Quan will fight to the death. refuses to "fight an old man," but Quan, now in his Iron Fist suit, replies, "Sorry, Young Fist. I've been waiting for this chance for freedom FAR LONG."
However, once the fight begins, immediately senses that his opponent lacks any perceivable martial arts skills and realizes that he is not the true Quan Yaozu. As the Immortal Weapons manage to escape and defeat the guards during the fight, Changming reveals that he is, in fact, the true Quan Yaozu. He explains that he voluntarily stayed in the to keep K'un Lun's demons from escaping. However, upon seeing his lost love thrown into the Eighth City, Quan became disillusioned, and believed that K'un Lun was not worth saving, eventually rising up to rule the Eighth City as Changming. Rand and Fat Cobra manage to defeat Quan in the battle, and prepare to ask him the true nature of the and why they have been sent there.
However, soon discovers that the Immortal Weapons are pawns in a plan Quan has hatched. As the door to the Eighth City can only be opened from the inside by the Immortal Weapons, his plan was for the Immortal Weapons to make an escape attempt, thereby opening the gate and unleashing Quan and his army to take his revenge on the Seven Cities for having sentenced him and many of their citizens to an eternity in the Eighth City.
Quan forces Rand to lead him out of and back to K'un Lun, but after making it outside the gate, the two encounter Davos, who is waiting outside the gate with a sniper rifle. He tells that he has been sent there by Lei-Kung to assassinate Quan, as he and Lei-Kung believe that lacks the ability to take a life. In the ensuing battle, Rand manages to defeat both Davos and Quan, going as far as to take a bullet in the hand for the latter's actions impress Quan, who decides that may be living proof that K'un Lun is not the corrupt city it once was. Rand and Davos agree to guide Quan to K'un Lun and arrange a meeting between him and Lei-Kung to give Quan a forum for his grievances.
During the event Iron Fist and the Immortal Weapons are summoned to Bejing, China to close the gates of the Eighth City that are on the verge of opening. However, Doctor Strange's prediction that Iron Fist is the problem and not the solution comes true. Danny is placed under mind control which is also creating a mystical interference with the ability of the Immortal Weapons to close the gate. He is then forced to battle his allies, including War Machine who had accompanied their group on this trip. Thanks to War Machine knocking him out, the mission is completed successfully. Doctor Strange realizes that Iron Fist is now an Immortal Weapon of Agamotto, however, the ramifications of this are not explained.
Shang-Chi is told by Madame Web that people with spider powers are running amok in Manhattan. When he sees Iron Fist fighting the Spider-Man imposters and Peter Parker nearby, Shang-Chi springs into action. Bride of Nine Spiders inexplicably starts attacking and abducting her fellow Immortal Weapons. When trying to figure out what his recurring dream means, Shang-Chi learns from Silver Sable that she has found possible locations in Manhattan for Bride of Nine Spider's lair. Although Shang-Chi manages to defeat Bride of Nine Spiders and frees Iron Fist, he discovers that the person behind this is the demon Ai Apaec who is seeking to feed off the Immortal Weapons. As Shang-Chi fights Ai Apeac, Iron Fist scrambles to free the other Immortal Weapons. Shang-Chi mutates into a spider during the battle as a result of the infection, but Iron Fist uses his Chi force to cure Shang-Chi, leaving Iron Fist in a weakened state. After making sure Iron Fist and the rest of the Immortal Weapons are evacuated, Shang-Chi collapses the mansion hide-out on top of Ai Apeac leaving him immobilized for the Avengers to put back into custody.
In Defenders, Fat Cobra broke up a much needed dinner between Misty Knight and Iron Fist. Bloody and near death, he proclaimed "It's all my fault," and to "shut down the engines." Rand believes that this is connected to his earlier adventures with the Defenders, which mysteriously none of said Defenders can seem to talk about it to others, as if due to a mystical force. Later, Danny learns that someone is hunting the immortal weapons and has succeeded in killing Dog Brother Number One, Tiger's Beautiful Daughter, and Bride of Nine Spiders. Enlisting the Help of his Defenders teammate the Silver Surfer, they research the massive amount of diary entries left by the previous Iron Fist, Orson Randall, and his team "The Confederates of the Curious". Both the Surfer and Rand are astounded that all of Randall's heroics have been forgotten, with The Surfer saying that "this would be the equivalent of the world forgetting the Avengers". The Prince of Orphans appears and initiates a fight with Rand, and confesses that he killed the other Immortal Weapons because him and his team were playing with powers he couldn't understand. The Prince of Orphans mistook the Defenders exploits for the Immortal Weapons and murdered them without cause. The Silver Surfer disposes, by spitting him into a volcano, although he would later escape and take control of the Concordance Engine. In the end Dr Strange changes time so that the Defenders never formed and so prevented the deaths of all the Immortal Weapons.