The exact nature of the Exorcists' creation and the gene-seed used in their Founding has remained classified by a special Bull Absolute of the Inquisitorial Representative issued at the time of their Founding. The Chapter has long-standing and strong links with the Inquisition and certain factions within the Ordo Malleus in particular, and it is most likely that it is the sponsorship and designs of that Ordo that has given them their unique character, and may well have specified their creation, either as a grand experiment or for some singular purpose. They are unusually resistant to both daemonic possession and Chaotic corruption. As part of their initiation into the Chapter, Exorcists Astartes are forced to serve as Daemonhosts for a short time before the possessing daemon is expelled ba