As the edict of decimation would state, "War is unequivocal, uncaring, unforgiving and blind. Iydris was one of the legendary Crone Worlds, which once formed the heart of the lost Aeldari empire before they were consumed by the creation of the vast Warp rift that was the Eye of Terror following the birth of the Chaos God Slaanesh. While one part of the IVth Legion turned Olympia and its surrounding star systems into an Empire of Iron, a large contingent of the Iron Warriors accompanied Perturabo to Terra alongside the rest of the Traitor Legions in the climactic Siege of Terra where he supervised the bombardment and siege of the Emperor's Imperial Palace by the forces of Chaos. Perturabo believed Fulgrim's visit had something to do with Mars. He made the long ascent upwards to the polished marble spire, the night before leaving Terra for a life of war. Instead he chose an ancient name that he had long favoured, a name that some claimed had been found in a forgotten text from before the fall of humanity -- a text written in a language only the boy in his precocious ability had succeeded in translating: Perturabo. It is then not perhaps unsurprising, given the IVth Legion's predilection for open battle, its employment in siege assault -- the most dangerous and unpredictable of all forms of line warfare -- and its willingness at every level from its primarch downwards to accept attrition as the price of victory, that the Iron Warriors are estimated in many sources to have suffered the highest overall number of casualties taken over time of any of the Legions in the Great Crusade. As Horus' rebellion ground on, the Iron Warriors took the time to humble their great enemies, the Imperial Fists, upon the isolated world of Hydra Cordatus that the Sons of Dorn had recently brought into Imperial Compliance. Perturabo's first memory is finding himself halfway up a cliff with no idea how or why he got there. All he knew was that he could see this great ugly spot in the sky that seemed to be watching him. While all of the Emperor's post-human sons displayed an intellect and capacity to absorb and adapt to new knowledge that surpassed that of an unmodified human, Perturabo's capacity for learning was truly incredible, and it swiftly came to be said that of all of the Emperor's sons, he was the most gifted in terms of raw scientific and technical intelligence. Nothing short of a killing blow can stop them, and even their immensely lesser Space Marine sons can fight for weeks on end without stop) | Limitless | Limitless, Range: Several meters range, kilometers with ranged weapons | Extended melee Range, kilometers with ranged weapons, planetary with daemonic aura | Hyperversal, Intelligence: Extraordinary Genius (Each Primarch possesses intelligence far above what any unaugmented person and even most Space Marines are capable of achieving, and they are each masters in their own respective fields of combat, being considered the greatest generals humanity has ever produced. When the people of Olympia rebelled against the rule of the Iron Warriors, Perturabo's anger was terrible to behold. Something this powerful and terrible deserved a name to strike fear into the hearts of all who saw it, a name that would resonate down the millennia until the end of time, when the stars went out and the only light in the universe was the nightmare glow of the maelstrom's ever-devouring borders. Fulgrim met with his brother Primarch in the private inner sanctum of his command bunker with an enticing offer that Perturabo could not refuse; the means to make it so that the Lord of Iron's every desire could be made real and would never disappoint, never fail to live up to his fondest expectations, and never, ever be eclipsed. The fortress was a decoy of no real value, surrounded by twenty miles of killing ground. As they fought alongside each of their fellow Legions in turn, they gained an unmatched reputation for brutal efficiency in battle, mastery of armoured warfare and as artillerists without peer among the Legions. It was said of the Iron Warriors that there was no fortress built by the hand of humanity or that of the xenos they could not smash down, no stronghold they could not storm and no army they could not drown in its own blood through shot and shell. While Dorn would never baulk or paying such a price for victory, he rarely accepted large numbers of casualties except through necessity. Magma bombs and mass drivers boiled away the rivers and reduced fecund earth to arid dust. After his rediscovery by the Imperium, the young Primarch was brought to Terra to learn from his father about his chosen destiny and to meet some of his brother primarchs. After the Drop Site Massacre on Istvaan V, Perturabo became a giant of terrible rages and spontaneous violence. Mostly he's largely just left unmentioned and undefined. Furthermore, he was gifted with an affinity for technology, and was able to debate the finer points of the most esoteric arts with the highest placed Adepts of the Mechanicum. The Lord of Iron pressed on, intent on bringing their quest to completion. Beginning by isolating the four companies of the Imperial Fists that arrived to do battle from their orbital support, Perturabo began to carefully divide his enemy and destroy them piecemeal. Such events in retrospect only served to foment and amplify the resentment and discord within the IVth Legion and split it from the Imperium it served, and increasingly to derange its warriors in the face of some of the worst horrors the Great Crusade would ever face. Perturabo's inner sanctum was a treasure trove of wonders, miraculous creations and the most ancient history of Old Earth preserved in a hermetically sealed environment. The Lord of Iron counted none of his fellow Primarchs as close, but the Phoenician's adherence to perfection in all things had once provided common ground between the two superhuman warriors and allowed them to talk as trusted comrades-in-arms if not beloved brothers. Angron had berated him for wasting time on irrelevant details, while Guilliman had lauded him for his thoroughness. But it was first and foremost by his advances in warfare that Perturabo's dark fame was bred and his legend as the "Hammer of Olympia" was born. The rest of the Cadmean Citadel's defenders were slaughtered to a man and the surviving mortal refugees were enslaved by the Iron Warriors before they moved on to their next objective. Tell them their empty whispers fall upon deaf ears Finally, Perturabo was free. Fulgrim revealed the reason for his brother being drained of energy. Hydra Cordatus was reduced to a barren desert world by the Traitor Legion's assault. At this bloody edict some within the Imperial Court protested, believing that the Emperor had given absolute power of a Space Marine Legion to a madman, while others, more guarded in their criticism, opined only that command had been given too soon to the primarch -- unused as he was to the ways of the Imperium. Despite his gruff exterior and stoic demeanour, Perturabo showed a paternal affection for his gene-wrought sons, though on a far more reserved level than displayed by the Primarchs of the other Space Marine Legions. Another eight would follow before the martial power of two entire Space Marine Legions and their auxiliary Imperial Army forces had made planetfall. What does Perturabo look like now that he's a daemon prince? | At least Solar System level, possibly higher (Much stronger than his previous self, and doubtlessly superior to lesser Bloodthirsters. For at least a year, he was alone in the rural regions of Olympia and became a famed wanderer that would slay legendary beasts. Perturabo hefted Forgebreaker like a headsman at an execution and swung the mighty hammer in a wide arc, splitting the Phoenician's body wide open. In Horus' rebellion, Perturabo believed that there was no such thing as Loyalist or Traitor, only victor and vanquished. At the heart of the hologram, a vertical black label bisected the fiery orange heart of the Warp Storm. Perturabo arrived at Istvaan V in the wake of the bloody pacification of his homeworld of Olympia, a campaign that wiped out the entire population, and some claim tipped Perturabo and his Legion over the edge of madness and fully into the abyss of betrayal during the subsequent Drop Site Massacre, an infamous action that will echo forever in the history of the Imperium.