The Adeptus Astartes, known as the Space Marines, are the elite warriors of the Imperium. They are few in number and regarded with almost mythical aw by most folk, for they are inheritors of traditions founded by the Emperor Himself. The Space Marines are divided into Chapters, each possessing a thousand Space Marines along with its own support staff and spacefleet. It is said that there are around a thousand such Chapters in the Imperium.
A Space Marine is recruited in adolescence from among the most violent cultures of the Imperium. His body is hugely enhanced with new organs promoting muscle and bone growth to give him immense strength, size, and resilience. His mind is similarly enhanced; hypno-doctrination and sleep-learning give him both a fervent belief in the Imperium and the knowledge of weapons and tactics to bring the Emperor’s wrath to the battlefield. Upon completing his augmentation and training (which not all novices survive), he is issued with his wargear, including a suit of power armor. This armor is one of the most powerful symbols of Imperial might, depicted in statuary and stained-glass windows across the Imperium. Equipped with nerve-fibre bundles so it moves in sunc with his body, a Space Marine’s armor not only grants him great strength and protection but it a work of art, resplendent in the heraldry of his Chapter.
Each Chapter is independent from the Adeptus Terra. While most will eagerly answer the summons of a Warmaster or a plea for help from somewhere in the Imperium, some Chapters have their own agendas and cannot be relied upon entirely. All, however, serve the Emperor loyally with complete devotion.