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From Warhammer 40k - Lexicanum
→Prelude
==Prelude==
After the [[Ecclesiarchy|Ecclesiarchal]] Purges of the [[Age of Redemption]] in 321.[[M37]], the powerful and influential [[Saint Basillius]] emerged as an ascendant figure in the [[Imperium]]. He even commanded a 'puritas division', several [[Space Marine]] [[Chapter]]s which purged all he commanded. He worked with the [[Inquisition]] and [[Adeptus Arbites]] across [[Segmentum Solar]], making it mandatory for the populace to inform anyone they suspected as being affiliated to [[Chaos]] or [[Mutant]]s. The few civil liberties in the Imperium were striped back even further, and false allegations were common. However the level of insurrections in Segmentum Solar dropped almost completely.{{Fn|2}}
However when the [[Warp Storm]] [[Dionys]] appeared, it spread over dozens of systems and levels of mutation and [[cultist]] activity rose dramatically. Worse still, those [[Adeptus Astartes Homeworld]]s which lay in the path of the Warp Storm had their [[gene-seed]] corrupted. When Saint Basillius heard of this, he declared all those Chapters whose homeworlds had become corrupted to be rendered into his judgement. Such was his influence that the [[High Lords of Terra]] agreed to the decision, and 30 chapters were found to be corrupted. Basillius ordered that the 30 chapters take part in a great [[Crusade]] into the [[Eye of Terror]], and one by one the chapters solemnly undertook their quest of certain doom.{{Fn|2}}
