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[[Image:Crixus.jpg|thumb|right|200px|Crixus{{Fn|11a}}]]'''Crixus''' was a citizen of [[Ultramar]] during the youth of [[Marneus Calgar]].{{Fn|11a}}

Originally an [[Aspirant]] of the [[Ultramarines]], Crixus ultimately failed his training and was dismissed. He then took up the duty of training new Aspirants to become [[Neophyte]]s for the Ultramarines on the world of [[Nova Thulium]].{{Fn|11a}} However in truth Crixus' resentment over his rejection led him down the path of [[Chaos]] and he became a member of a [[Khornate]] cult, organizing blood rituals and pit fighting with Aspirants he managed to corrupt. The young [[Marneus Calgar]] and his companion [[Tacitan]] discovered this truth and during the struggle Crixus killed Calgar with a ritual knife. Tactican thereafter took on the title of Marneus Calgar.{{Fn|1a1b}}

In the subsequent battle, Crixus revealed he had originally been drawn by voices to the Khornate altar deep beneath Nova Thulium. He would have slain Calgar in battle had it not been for the intervention of the Ultramarine sergeant [[Space Marine Sergeant|Sergeant]] [[Arta]], who blew the cultist apart with his [[Bolt Pistolbolt pistol]].{{Fn|1b1c}}