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'''Alpha Primus''' is the prototype of the [[Primaris Space Marine]]s and the personal enforcer of Archmagos Dominus [[Belisarius Cawl]].

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]]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, 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 reveal of the [[Primaris]][[Space Marines]] on the [[Zar-Quaesitor]] Alpha Primus summoned Captain [[Vitrian Messinius]] to him using his [[Psyker]] abilities. He warned Messinius not to trust everything [[Cawl]] says, but did also say that [[Cawl]] has no desire to rule, and wishes for the salvation of mankind.{{Fn|4}}