Warhammer 40000: Space Marine -

: Most follow the Codex Astartes , which dictates a standard Chapter size of 1,000 battle-brothers to prevent the mass rebellions seen during the Horus Heresy . Creating a Homebrew Chapter

: A recruit (aspirant) undergoes a grueling transformation involving the implantation of 19 or more specialized organs, such as a second heart and a third lung. Warhammer 40000: Space Marine

: The foundation of their transformation is gene-seed , genetic material derived from the Primarchs —the 20 "sons" of the Emperor. : Most follow the Codex Astartes , which

: Space Marines are sterile and psychologically conditioned for eternal war, often lacking human emotions beyond a sense of duty and martial pride. : Space Marines are sterile and psychologically conditioned

The Space Marines, or , are elite, genetically modified super-soldiers engineered by the Emperor of Mankind . Standing roughly seven to eight feet tall, they are encased in Power Armor and possess superhuman strength, speed, and resilience.