I listened to the audiobook of Angel Exterminatus on a drive up to Warhammer World in 2019. It was maybe four hours each way, and the novel covers Perturabo and Fulgrim’s expedition into the Eye of Terror during the Horus Heresy. I’d always thought of Perturabo as the boring traitor primarch. The one who digs trenches. The one whose main personality trait is complaining that nobody appreciates him. By the time I parked at Warhammer World I genuinely felt bad for the guy, which is a strange thing to say about a mass murderer who strangled his own sister, but the novel does something clever with him. It lets you see the fortress he’s built around himself and understand that the walls are there because everything behind them got broken a long time ago.
GW published the first-ever official artwork of Daemon Primarch Perturabo this week, in the Eye of Terror: Reign of Iron book that goes on pre-order this weekend. He’s enormous. Mechanical limbs jutting out from his back, a knight-sized hammer in one fist, and what appears to be an entire weapons battery strapped to his torso. The mech-suit design is so heavily augmented that it’s hard to tell where Perturabo ends and the machine begins, which is probably intentional. WarCom described it as “perhaps the first ever proper depiction of post-ascension Perturabo ever published in a Warhammer book,” and I can’t think of an earlier one. He’s been a text-only character in the 40K setting for literally decades.
The Plan
The artwork came alongside a description of the Infinite Citadel, which is Perturabo’s grand strategy for conquering the Imperium. I want to talk about this because it’s so perfectly in character that it almost reads as a joke about the Iron Warriors.
Perturabo’s plan is to build fortifications. That’s it. But on a galactic scale.
An expanding ring of brutalist fortresses, designed by Perturabo himself, pushing outward from the Eye of Terror toward Terra. Entire worlds get conquered, stripped of resources, and turned into keeps. The walls of the Infinite Citadel span solar systems. When resistance shows up, the Iron Warriors dig in and let the attackers throw themselves against prepared defences. When the resistance breaks, the ring expands again.
The secondary effect is that the sheer carnage pleases the Chaos Gods enough to thin the veil between realspace and the Warp. By the time the Citadel reaches Terra, the barrier should be weak enough that Perturabo can physically walk upon Imperial soil and finish the job in person. So the construction project is also a ritual. The siege IS the summoning.
I’ve been thinking about this since I read the WarCom article and I keep coming back to how different this is from every other Chaos strategy in the setting. Abaddon launches Black Crusades. Angron drops out of the sky and kills everything. Magnus schemes with sorcery. Mortarion spreads plagues. Fulgrim does whatever Fulgrim does these days, I think the last mention had him on some pleasure world doing unspeakable things. Perturabo’s master plan for galactic domination is a construction project with a timeline measured in millennia. He’s going to conquer the Imperium the same way you’d build a road. One section at a time, properly surveyed, with load-bearing walls.
Though I wonder if the timeline works against him narratively. GW has been advancing the 40K story relatively quickly since 8th edition, and a plan that explicitly takes thousands of years to complete is hard to make dramatic in a setting that moves in campaign-book-sized chunks. The Infinite Citadel might end up being more of a background threat than an active story, something mentioned in codex fluff while the actual narrative focuses on faster-moving conflicts. Or GW could accelerate it with some Warp-time nonsense, which would undermine the entire appeal of the plan being a patient, methodical siege.
Actually, maybe that’s the point. Maybe the Infinite Citadel isn’t supposed to be a narrative climax. Maybe it’s just Perturabo doing what he’s always done, building walls in the background while everyone else gets the glory.
Olympia and After
So yeah. Perturabo. Lord of Iron. Daemon Primarch of Chaos Undivided. Born on Olympia, which was a world of warring city-states, basically ancient Greece with slightly more backstabbing. He was adopted by the Tyrant of Lochos, a man called Dammekos, and immediately started being better than everyone at everything. Architecture. Mathematics. Siege warfare. You name a field of study and Perturabo mastered it and then resented the fact that nobody seemed impressed enough.
There’s a detail in the older lore that I always found interesting. Perturabo could see the Eye of Terror from Olympia. Not metaphorically. He could literally see it in the sky, a maelstrom of Chaos visible only to him. He kept this secret for his entire youth. Whether this was a genuine psychic vision or an early form of Chaos corruption reaching out to him is one of those questions that the lore has left deliberately vague.
When the Emperor arrived, Perturabo submitted instantly. No test of strength, no challenge, no bargaining. He just knelt. And then he was given command of the IVth Legion, which he renamed the Iron Warriors, and immediately discovered that his legion had been used as siege specialists and garrison troops for years. Tiny squads scattered across the Imperium, holding fortifications on worlds nobody cared about.
Perturabo did what you’d expect a genius control freak to do. He reviewed every war record, restructured the entire legion, and started winning sieges at a pace that embarrassed his brother primarchs. The Iron Warriors took the worst assignments. The most fortified worlds, the most grinding campaigns, the highest casualty rates of any legion. Perturabo accepted attrition as the price of victory and his sons bled for it.
The rivalry with Rogal Dorn of the Imperial Fists started somewhere in here. GW has written it a few different ways across editions, but the core of it stays the same. Dorn was praised for building the defences of Terra. Perturabo was sent to tear down everyone else’s defences, which is harder and uglier work, and got no recognition for it. Whether Perturabo’s resentment was justified or whether he was just incapable of seeing his own value without external validation depends on which novel you read. Probably both.
Fulgrim and the Maugetar Stone
The Heresy-era stuff fills entire novels, and I’m not going to try to compress the whole arc here. But the moment that I think defines Perturabo more than anything, including the decimation of Olympia, is what happened with Fulgrim on the Crone World.
After the Drop Site Massacre, Fulgrim approached Perturabo with an offer. Come with me into the Eye of Terror. There’s a weapon called the Angel Exterminatus. It’ll give us unlimited power. Perturabo, who was already bitter and broken from massacring his own homeworld, agreed. This was after he’d strangled his adoptive sister Calliphone during the razing of Olympia. I should mention that, because it matters. He didn’t kill her in the heat of battle. He killed her during an argument where she told him the truth about what he’d become.
Fulgrim’s expedition was a lie. The weapon didn’t exist. The whole thing was a trap so Fulgrim could drain Perturabo’s life force through an artefact called the Maugetar stone, which had been disguised as a gift, and use the stolen energy to ascend to daemonhood. Perturabo was literally being consumed by his brother, used as fuel for someone else’s ascension.
He broke free. Barely. Rallied enough strength to attack Fulgrim and shattered the Palatine Phoenix’s mortal body, though it didn’t matter because Fulgrim was reborn as a daemon prince of Slaanesh anyway. An ambush by surviving loyalist Astartes, Salamanders, Iron Hands, and Raven Guard, interrupted the fight. Perturabo let them withdraw. He was done.
The thing about Perturabo that the Fulgrim betrayal makes painfully clear is that he is a man who gets used. Dammekos used him as a weapon. The Emperor used him as a siege engine. Horus used him as a logistics officer. Fulgrim tried to use him as a battery. And his response every single time was to endure it, resent it, and eventually lash out in the worst possible way. The decimation of Olympia. Joining the traitors. Eventually, after the Iron Cage, feeding captured Imperial Fists gene-seed to the Chaos Gods and ascending to daemonhood himself.
The Iron Cage
After the Heresy ended, Perturabo still had unfinished business with Dorn. He constructed the Eternal Fortress, an impossibly complex fortification on a world in the Eye of Terror, and basically dared the Imperial Fists to come take it. Dorn, who was emotionally shattered from the death of the Emperor and the siege of Terra, took the bait. The Imperial Fists attacked and were systematically annihilated. It took the arrival of Guilliman and the Ultramarines to extract Dorn and the survivors.
Over 400 Imperial Fists died in the Iron Cage, and Perturabo claimed their gene-seed. He offered it to the Chaos Gods and ascended to become a Daemon Prince of Chaos Undivided. Not pledged to any single god. He treats the Warp the same way he treats everything else, as a tool. A system to be mastered and exploited, not worshipped.
And then he went to Medrengard, his daemon world inside the Eye of Terror, and started planning.
For ten thousand years.
What Medrengard Means
The WarCom article includes this line: “Despite his fearsome appearance, Perturabo’s deadliest weapon is his mind, and he’s been engaging it inside the towers of Medrengard for thousands of years. Every dispatched warband and recalled fleet has been part of his intricate manoeuvres.”
Ten thousand years of planning. Every Iron Warriors warband that’s fought anywhere in the galaxy for the last ten millennia has been a piece in his strategy. The raids, the sieges, the alliances with Vashtorr, the collaboration with Abaddon during the Arks of Omen, all of it was preparation. The Infinite Citadel isn’t a sudden plan. It’s a plan that took ten thousand years to set up and is only now beginning to execute.
There’s also an interesting piece of artwork in the Reign of Iron book showing Iron Warriors fighting what appear to be Black Legion Chaos Space Marines. BoLS flagged it and I noticed it too. Why are the Iron Warriors killing other traitors? The answer probably ties into the Infinite Citadel. If Perturabo’s plan involves total control of the territory between the Eye and Terra, he can’t have rival Chaos warbands operating independently inside his siege lines. The Infinite Citadel might require eliminating allied threats as much as Imperial ones.
Whether Perturabo gets a miniature out of all this is something everyone’s speculating about and I don’t have anything useful to add beyond “probably, eventually.” The artwork is extremely detailed and looks like it could be concept art for a model. Five Daemon Primarchs have minis now if you count Fulgrim’s recent release, plus two loyalists with Guilliman and the Lion. The Dorn vs Perturabo rivalry is the most obvious grudge match GW has left in the tank, and you’d need both models to sell it properly.
I’m more interested in what the Infinite Citadel means for the 40K setting long-term. Perturabo isn’t coming to win a single battle. He’s coming to restructure the galaxy. The Warp is his building material and fortification is his worship. Every other traitor primarch lets Chaos change them. Perturabo is the one who’s trying to change Chaos back, to make it something rational and engineered. Ten thousand years of brooding in a daemon fortress and his master plan is still, fundamentally, the same thing he was doing as a boy on Olympia. Build a wall. Make it bigger. Make it perfect. Kill anyone who says it isn’t good enough.
I’m going to pick up Reign of Iron this weekend. Partly for the detachments, partly for the lore. But mostly because I want to see how GW draws the inside of Medrengard. Ten thousand years of a daemon architect building his perfect fortress. The floor plans alone would be worth the price of the book.
