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===Destruction===
*{{Main|Thirteenth Black Crusade}}
During the [[Thirteenth Black Crusade]], Cadia was subject subjected to the largest Chaos invasion since the [[Horus Heresy]]. An opening surprise attack by the [[Volscani Cataphracts]] wiped out the Cadian High Command, forcing [[Ursarkar E. Creed]] to become its sole Castellan.
After vicious fighting only one fortress, Kasr Kraf, remained. However, the tide of the battle nearly turned thanks to the intervention of [[Eldar]] and [[Trazyn]], who sought to reactivate the Pylons on the world and turn back the Warp. In the final battle beneath the surface of Cadia, Abaddon was forced to retreat as the Pylons were activating, but redirected debris from the [[Blackstone Fortress]] ''Will of Eternity'' into the planet. Cadia was shattered, and as the Pylons faltered the planet was swallowed into the Warp. Castellan [[Creed]] and his Cadian 8th stayed behind to cover the evacuation and their fate remains ambiguous.{{Fn|10}}