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Primus' true nature is unclear, but he seems to have a chimeric [[Gene-Seed]] made up of samples from multiple [[Space Marine Legion|Legions]].{{Fn|3}} Primus was originally created by Cawl in an attempt to recreate the process the Emperor used to create the [[Primarch]]s, in order to create a superior class of [[Space Marine]]es.{{Fn|2b}} The process failed, however, and instead Alpha Primus was used as the prototype for the Primaris Space Marines. Primus was much more heavily modified than most Space Marines, moreso more so than even the Primaris', being described as having been rewritten on a genetic level rather than merely [[Creation of a Space Marine|implanted]]. The process made him a [[Psyker]] of unparalleled power amongst the Astartes, as well as physically more powerful than even the Primaris', yet still not to the extent of a [[Primarch]]{{Fn|2b}}. The flaws in the process used to create him also leave him in constant physical pain across the entirety of his body.{{Fn|2b}} Notably, Primus does not consider himself loyal to the [[Emperor]] anymore but rather a servant of Cawl above all else, and considers himself the personal property of Cawl.{{Fn|1}}{{Fn|2b}} Primus is the only one of his kind, as Cawl has since lost the technology needed to create warriors of his class.{{Fn|2b}}

During the [[Indomitus Crusade]], the forces of [[Fabius Bile]] invaded the ''[[Zar-Quaesitor]]''. Cawl initially suspected that Bile sought the [[Sangprimus Portum]], but in truth was instead seeking Alpha Primus. Primus was cornered by Bile and his abominations and overpowered. Bile was able to remove Primus' [[Progenoid Glands]] and as Cawl confronted him , revealed he had equipped the Primaris prototype was with a mutagenic agent that would activate if Fabius were to die. This forced Cawl to allow Bile to escape with the stolen Progenoid glands, but Primus survived the attack.{{Fn|3}}