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{{QuoteBox|quote = '''''Tell me why, father. Why stand with the Arch-Traitor?<br>I do not stand with Horus. I stand against the Emperor. Do you understand, Kauragar? I am free now. Free.'''"<br>-World Eaters [[Centurion]] [[Kauragar]] and the Primarch Angron, after the former's mortal wounding by the latter.{{Fn|24}}

After the opening of the Great Betrayal, Angron and the World Eaters were invited by the primarch [[Lorgar]] to accompany him and a force of his [[Word Bearers]] on a campaign into the [[Ultramar]] [[sector]]; the [[Shadow Crusade]]. A force of around 70,000 World Eaters assembled around their Primarch and joined a smaller force of Word Bearers. While Lorgar had a specific first target in mind - [[Armatura]] - the World Eaters insisted on attacking four other worlds of Ultramar upon the way, killing all who stood against them. These bloody diversions caused a rise in tensions with the Word Bearers that almost came to blows resulted in void-battle between their fleets, but after an [[Eldar]] attack on them was jointly repulsed, union of purpose was reached and [[Battle of Armatura|Armatura was successfully assaulted]].{{Fn|27}}

It was then that Lorgar revealed to his brother the goals of the campaign; firstly, to finish creation of the [[Ruinstorm]], begun by another force of World Eaters during the [[Battle of Calth]]. Secondly, a more private goal of the Word Bearers primarch; the saving of Angron's life from the Butcher's Nails. Lorgar claimed that his abilities had allowed him to discern that the Nails were slowly killing Angron and destroying his mind. Thus, he had created a second purpose of the ritual necessary to finalise the [[warp storm]]'s creation, one that would ensure Angron's effective immortality. Exactly what Lorgar meant by this would not become clear until some short time later. To Angron's shock, the final phase of Lorgar's ritual had to be carried out upon Nuceria.{{Fn|16a}} Upon arriving at the planet, a delegation from both legions descended to the long-abandoned battle-site in the Desh'elika Mountains which Angron had been teleported from, and where the Eaters of Cities had died, to find that the bones of Angron's fallen followers had been left to rot in the open air. Enraged by this, Angron led the delegation to the capital, to discover more of what had happened since his discovery and the induction of Nuceria into the Imperium as a compliant world. Learning that the legend of him told on the world portrayed him as a coward who abandoned his army to be slaughtered, Angron ordered a simple order to the field commanders of the World Eaters and Word Bearers legions: Kill everything and everyone upon the planet.{{Fn|16d}} The slaughter would ultimately be interrupted on the sixth day when an armada belonging to the [[Ultramarines]] legion, led by Roboute Guilliman himself, arrived and engaged the traitor forces. Battering aside the enemy fleet, the Ultramarines were able to land ground forces, bringing the legions to battle. During the ground war, the three primarchs present would all meet in hand-to-hand combat, with Lorgar being beaten back, leaving Guiliman and Angron to duel. It was then that Lorgar discerned the fateful moment, the opportunity the slaughter and rage of the war around him and titanic duel in front of him afforded him; the culmination of his ritual to save Angron was at hand. Despite a last-minute attempt to prevent the sorcery by a the World Eaters' surviving [[Librarians]], the ritual was completed: Angron was transformed. Now a transcendent being of claws, steaming, red flesh and pure, volcanic rage, Angron roared to the heavens as Guilliman and his Ultramarines withdrew in disarray.{{Fn|16e}}