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From Warhammer 40k - Lexicanum
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Access to the Pylons was generally forbidden, with it being deemed a rare privilege to be granted permission to visit if one were not of sufficient military rank.{{Fn|9c}}
During the final stages of the [[Thirteenth Black Crusade]], the [[Magos]] [[Belisarius Cawl]] worked with the [[Necron Lord]] [[Trazyn]] to fully activate the Pylons and push the Eye of Terror back. However, in the end, [[Abaddon]] collided the debris of the [[Blackstone Fortress]] ''[[Will of Eternity]]'' into Cadia's surface, destabilizing the Pylons as they were fully awakening. In a catastrophic chain reaction, the Pylons were destroyed, which caused Cadia to be dragged into the Warp.{{Fn|10}}
==History==
During the [[Thirteenth Black Crusade]], Cadia was subjected to the largest Chaos invasion since the [[Horus Heresy]]. A surprise opening 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}}
Only a handful of its citizens were able to escape in an evacuation fleet led by the [[Phalanx]]. Of its population, fewer than three million survived.{{Fn|10}}
