Created in the midst of the Great Crusade, the Ferineum Mortis Cohort participated in the subjugation of many worlds and primarily clashed against xeno empires eventually allowing the Priesthood of Mars to claim the world Rikthet which would eventually become the host-world for the cohort's forces. After the Horus Heresy the Cohort would swear to continue the purpose of the Emperor's Crusade putting down xeno empires and expanding the realm of humanity as in their Edict of Eternal War. In war the Cohort is known for their extensive use of direct assault automata combined with heavy fire from flanking Vorax-class automata.