One of the twenty Primarchs created by the Emperor of Mankind for the Great Crusade, Perturabo and his brothers were scattered to the stars by the forces of Chaos. Landing on Olympia, Perturabo found by the guards of Dammekos, the Tyrant of Olympia, while crawling in the mountains. Recognizing he was no ordinary child, Dammekos took Perturabo in and raised as his own son. While Dammekos gave the boy warmth and affection, Perturabo never returned it. When the Emperor came to Olympia, Perturabo submitted to him and overthrew Dammekos. The fallen Tyrant would try to mount a resistance, but it would fail. Perturabo was given command of the IV Legion of the Adeputs Astartes, the Iron Warriors.
During the Great Crusade, the Iron Warriors became masters of siege warfare, developing a rivalry with Rogal Dorn, Primarch of the Imperial Fists, with a similar mastery of sieges. Resent, bitterness, and the eventual rebellion of Olympia drove them into allegiance with the traitors during the Horus Heresy. After the Horus Heresy, the Iron Warriors defeated the Imperial Fists in the Iron Cage incident, and Perturabo ascended to Daemon Prince, ruling over the Daemon World of Medrengard in the Eye of Terror.
For more information on Perturabo, see his entry under Horus Heresy - Traitor Legions.
- Ascended to a Higher Plane of Existence: He's ascended to Daemon Primarch long ago by the time the series starts.
- Evil Overlord: As Daemon Prince of Medrengard.
- A Father to His Men: Only in the literal sense, as the Horus Heresy indicates that even before declaring for Horus he was killing Iron Warriors who had fallen from favor.
- The Ghost: His presence is literally felt on Medrengard, and figuratively in his Iron Wariors making it their home. He otherwise makes no appearances.
- Greater-Scope Villain: As the supreme leader of the Iron Warriors, he's pretty much this.
- Hates Everyone Equally: In the end. Despite being a largely unpopular Primarch, he enjoyed spending time with Magnus as they both shared an interest in researching the great innovators of Terra's past.
- Hidden Depths: He was in fact a cultured artist; the fact no one knew that pissed him off more. By the time he becomes a Daemon Primarch, as far as we can tell, he had all but abandoned this aspect.
- Orcus on His Throne: He hasn't led an attack on the Imperium since ascending to Daemonhood. Averted with recent materials where he's been revealed to occasionally lead an attack with devastating results.
The leader of the Warsmith's third company. Has not been named Captain despite holding the post for two centuries, due to his status of having some Imperial Fists gene-seed in with the his Iron Warriors gene-seed.
- A Father to His Men: Surprisingly enough, he is this. While he is a member of Chaos and Kick the Dog is practically a requirement, he would never send his men to their deaths without good reason and wouldn't execute them for anything less than outright treachery. It's noted in-universe that he would have been a great Imperial leader had things been different.
- Arch-Enemy: To Uriel Ventris.
- Artificial Limbs: Loses his right arm in the siege, and is given an augmetic arm that belonged to one of the Warsmith's old lieutenants as a sign of favour. He later replaces it with a liquid metal arm of xenos origin, which drinks blood and contains a power directly opposed to the daemon in his axe.
- Bald of Evil: As a space marine, natch.
- Berserk Button: At one point, he nearly gets dismembered by one of the major Chaotic players of the setting, Huron Blackheart, because he mouths off when Huron calls him "half-breed".
- Black Sheep: Amongst the Iron Warriors, Honsou is pretty indifferent about the Legion and their legacy, which is why his actions are pretty atypical and he's practically indifferent to anything but his own desires.
- Breakout Villain: Storm of Iron was written as a standalone novel, but Honsou quickly became a popular character, and one of Graham's favorites to write.
- Chainsaw Good: Wields a chainsword.
- Combat Pragmatist: Not afraid of fighting dirty and knows how to turn a battle in his favour. In unarmed combat, he's well described as a down and dirty gutter fighter.
- Dark Chick: Among the Warsmith's other lieutenants, he was certainly the most tactically flexible and emotional as opposed to Forrix's jaded stoicism and Kroeger's constant rage.
- Deadpan Snarker: It's how he lets his anger out in a way that isn't killing people. Although he does kill a lot of people.
- Demonic Possession: He gets "possessed" by a minor daemon during the battle for Hydra Cordatus, though it only really used him to channel its power. The Warsmith is impressed.
- Dragon Ascendant: By the time Dead Sky, Black Sun rolls in.
- Embarrassing Nickname: Amongst the non-loyalist characters, he's called the half-breed. He isn't shy about advertising it himself.
- Evil Is Petty: Does some of the worst things in the setting just to get back at Uriel, right down to killing a world. To put this in perspective: he killed an entire world, set a Daemon Prince free, and killed almost half the Ultramarines(when casualties from both the Bloodborn invasion and the star fort battle are added up), all to spite a single man.
- Evil Weapon: His daemon axe. Of course, Honsou isn't that far behind it.
- Mixed Ancestry: He was created using a combination of Iron Warriors and Imperial Fists gene-seed. And it's why the other captains hate him.
- The Unfettered: The author describes him this way, as someone totally unbound by ethics and who doesn't give a damn about the consequences of his actions so long as he comes out of it better than he otherwise would.
- Villain Protagonist: Of the Iron Warriors side of the ongoing conflict.
- Villain Respect: Contrary to most Chaos and even Imperial leaders, he shows a surprisingly amount of respect for both allies and enemies if they prove themselves Worthy Opponents.
- Visionary Villain: Genuinely believes in the dream of Horus using the power of Chaos to unite humanity and protect it from Xenos threats. Of course, being a Chaos Marine, it's more along the lines of "subjugate humanity", and he's quite easily sidetracked into his elaborate campaign of vengeance against Uriel Ventris.
- You Are in Command Now: "I do not name you Captain. I name you Warsmith."
An ancient Warsmith of an Iron Warriors Grand Company, leading the siege on Hydra Cordatus. He is planning to capture the gene-seed within to assure his status as a Daemon Prince.
- An Axe to Grind: He wields a midnight black daemon axe.
- Ascended to a Higher Plane of Existence: Goes onto become a Daemon Prince.
- Baby Eater: He triggers his ascension by feeding on Progenoids after finally breaking into the Citadel. The organic "storage" for is essentially a tailor-cultured fetus.
- Big Bad: Of his Five-Man Band in Storm of Iron.
- Bling of War: Wears Terminator Armour. Also, has a throne Perturabo himself allegedly crafted.
- Brown Note: He's seething with so much Chaos, just looking at him causes nausea in his own underlings, and keeps an entire regiment of guardsman from being able to raise their weapons against him. It's because of his transformations.
- Crazy-Prepared: At Hydra Cordatus, he probably had a hand in getting the Mechanicus infiltrator, which came about roughly a hundred and fifty years before Storm of Iron, and presumably built the hidden teleporter in the citadel which they used to infiltrate Cycerin in towards the end of the siege.
- Karma Houdini: Becomes a Daemon Prince.
- Large and in Charge: He's big, even for a Space Marine.
- No Name Given: Until Angel Exterminatus, also by McNeill, anyway. Barban Falk, in case you were curious.
- Time Abyss: Originally came from Olympia, and took part in the Great Crusade. He even designed the Citadel on Hydra Cordatus.
The First Captain of the Warsmith's Grand Company. Once eagerly believed in Horus's dream of uniting the galaxy under Chaos, but has become jaded over ten thousand years.
- Badass Bureaucrat: His chief talent is supreme organisational and logistical skills. He's seen running the day-to-day operations of a siege until he figures out what the Warsmith is becoming, after which he rejoins the fighting with relish.
- Bifurcated Weapon: A combi-weapon.
- Bling of War: His combi-bolter is described as "Heavily ornamented"
- The Cynic: Gave up on Horus's dream long ago.
- The Dragon: He's the Warsmith's chief lieutenant.
- Frontline General: Once he puts on the Terminator armour and gets into the trenches.
- Karmic Death: After slaughtering a Titan's bridge crew, he finds himself facing the guns of the other Titan, and has enough time for a Little "No" before the Titan completely annihilates him.
- Power Fist: Another favoured weapon of his.
- Time Abyss: Is over 10,000 years old.
The Captain of the Second Company of the Warsmith's Grand Company. Slowly falling into the grips of Khorne.
- The Berserker: And he knows it.
- The Brute: Lacks anything remotely resembling finesse. Even before Khorne got to him, he favoured straight-up melee combat and breach-storming over anything else.
- Chainsaw Good: Wields a Chainsword.
- Eye Scream: How he dies. Ironically, it comes at the hands of the guardswoman he had enslaved, tortured, and abused throughout the book.
- Gorn: Yep. Spends almost all of his time when visible either drenched head-to-toe in blood, killing people violently, or generally going anything he can to kill people.
- Nice Job Fixing It, Villain!: He breaks from guarding the Daemon Engines to get his slaughter on. This bites him in the ass when these Daemon Engines get destroyed by the Imperial Fists, angering the Warsmith.
- Time Abyss: Ironically, Forrix still calls him a newblood. Even he lampshades how ironic it it.
The Sorcerer of the Warsmith's Grand Company.
- And I Must Scream: The Warsmith ends up turning him into a Chaos Spawn after deciding He Has Outlived His Usefulness. It's implied that (at least, for a time) he's still sane and aware of his new state.
- Bald of Evil: Hairless, and very evil.
- Evil Genius: Acts as the Warsmith's personal precognitive, using sorcery to find out details about what will happen in the future.
- Evil Sorcerer: Runs a whole coven of these. Also acts as the Warsmith's personal seer, and helped kick off the events of the series as a whole by finding Hydra Cordatus had gene-seed on it.
- Eye Scream: His eyes have been permanently sewn shut.
- Fate Worse than Death: The Warsmith turns him into a Chaos Spawn, as detailed under And I Must Scream.
The regiment of Imperial Guard tasked with defending the Citadel of Hydra Cordatus.
Leader of the 383rd Jouran Dragoons.
- Badass Normal: Fights and takes off Honsou's arm in sword-to-sword combat.
- Blue Blood: Mentioned offhandedly to be the heir of a noble family on Joura.
- Frontline General: Leads his men from the front during the first attack on the Iron Warrior lines.
- The Leader: Commander of the citadel on Hydra Cordatus.
- Killed Off for Real: Killed after taking off Honsou's arm, when Honsou stabs him through the chest.
The demi-Legion of Titans assigned to the Citadel of Hydra Cordatus.
Leader of the Legio Ignatum forces on Hydra Cordatus.
- Dying Moment of Awesome: Goes down severely wounding the Dies Irae, with his Titan's meltdown managing to disable the corrupted Imperator for the majority of the book. The damage he causes eventually leads to the Dies Irae's fall.
- Fatal Flaw: Pride and Wrath: He decides to go head-to-head with Dies Irae, a corrupted Emperor-class Titan, out of anger and his own pride. It gets him killed, along with the bulk of his Legio.
- General Failure: Somewhat - he is shown to be competent in Titan-scale combat, but his tactical decisions cause the Jourans to be badly mauled.
- We Hardly Knew Ye: Gets killed in the same chapter he is introduced in.
The members of the Adeptus Mechanicus overseeing the Citadel's systems.
Archmagos Caer Amaethon
The leader of the Adeptus Mechanicus on Hydra Cordatus. Responsible for all the citadel's systems.
- Asshole Victim: Considering he was responsible for letting the guard regiments get poised, and killed several thousand retreating guardsmen when he ordered the tunnels sealed, it's hard to find sympathy when Naicin offs him.
- Body Horror: He's nothing but a face and a few scraps of brain, kept alive by a life-support tank.
- Cloudcuckoolander: As a result of his extreme age, Amaethon's not all there.
- The Leader: Top member of the Adeptus Mechanicus on Hydra Cordatus.
Amaethon's ambitious second-in command.
- Body Horror: His true face is a mass of worm-like tendrils, with multiple eyes and needle teeth. His fingers are also acid-spraying proboscises.
- Cool Mask: One made of bronze. Actually a case of Malevolent Masked Man, considering his true identity.
- Kill and Replace: Actually a mutant, who killed and took the real Naicin's identity.
- Manipulative Bastard: Outright lies to Leonid and Vauban that Amaethon was the one who blew the tunnels, killing thousand of guardsmen to try and get himself promoted.
- Smoking Is Cool: Smokes specially rolled cigars, and swears blind that they're healthy.
The leader of The Sons of the Forge, notable for being the one who tortured Imperial Fists Captain Lysander.
- Arch-Enemy: To Lysander.
- Black Sheep: Most Iron Warriors don't really like him due to how often he works with daemons, in fact its hinted he's not even a Warsmith, but a WARPsmith.
- Cold-Blooded Torture: To Lysander, in between talking about how awesome he is.
- Crazy Enough to Work: His most well know plan involved: Finding a Tyrant Hive Fleet (this after the first Tyranid war but before the other hive fleets came to the Galaxy), stuffing it into a space hulk and wiring a Navigator into its controls and fired it right at Terra.
- Deal with the Devil: Heavily works with Deamons.
- Legacy Character: There is in fact two, a Warlord during the Age of Strife and the current Warsmith.
- Small Name, Big Ego: Claims to be the reincarnation of a great warlord and with surpass even Horus in the level of feats, he's the leader of a warband that's been wiped out, twice.
Soltarn Vull Bronn, the Stonewrought
Once the greatest of the Iron Warriors' combat engineers, Soltarn Vull Bronn ended up under Honsou's authority, and commanded his forces while Honsou went on a mission behind the lines.
- A Day in the Limelight: He's the viewpoint character of "The Iron Without" short story, and appears in Angel Exterminatus.
- The Engineer: His skill at construction was so notable that he was one of the few Iron Warriors with a fancy nickname.
- Even Evil Has Standards: He retains some semblance of his honour, even into the 41st millennium. It doesn't work out for him.
- How the Mighty Have Fallen: During the Heresy, even Perturabo respected his entrenching skills. Fast-forward ten thousand years and he's subordinate to Honsou.
- Killed Off for Real: Betrayed and killed on Calth.
- Red Baron: "The Stonewrought".