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Acheran was originally an officer of [[Cato Sicarius]]' 2nd Company. However he became the Captain of its Second Company after Sicarius was lost to the [[Warp]] early in the [[Indomitus Crusade]] due to the formation of the [[Great Rift]]. One of his notable actions was leading the attack on the [[Black Legion]] held world of [[Nemendghast]].{{Fn|3}} He later took part in the defense of the [[Realm of Ultramar]], when it was [[Plague Wars|invaded]] by the forces of [[Nurgle]] and led the Second Company to many victories over their foes.{{Fn|1}} However in the later years of the invasion, Sicarius was among the [[Imperium]] forces that arrived with [[Lord Commander]] [[Guilliman]] to aid Ultramar .{{Fn|2}} Despite being badly outnumbered by [[Black Legion]] forces during the [[Nemendghast Raid]], Acheran refused to leave and instead ordered an attack to destroy the Daemonic factories of [[Nemendghast]]. The orbiting [[Chaos]] fleet soon became alerted to Acheran's attack and as it is not known if began moving to aid Nemendghast, the crew of the nearby [[Strike Cruiser]] ''[[Carpatia]]'' warned Acheran will now retain of the fleet. The Captain then immediately led the remnants of his Captaincyforces in a final attack that destroyed the Daemon factories, but by then they were swarmed by the Black Legion.Acheran knew they could not break free from the Traitors and instead ordered the [[Vanguard Librarian]] [[Maltis]], to escape and bring word of what had happened to Chapter Master Calgar. Maltis successfully returned to the ''Carpatia'', which then escaped to [[Vigilus]]{{Fn|24}}