The Space Marines know no fear. Created by the Emperor of Mankind through genetic manipulation, the Adeptus Astartes stand as humanity's greatest defenders against the darkness that threatens to consume the Imperium.
Each Space Marine is a product of thousands of years of genetic research, psycho-conditioning, and rigorous training. They are implanted with nineteen gene-seed organs derived from the genetic material of the Primarchs, the Emperor's own sons, transforming them into beings far beyond normal human capability.
The process of creating a Space Marine is long and arduous. Young initiates, known as aspirants, must first prove themselves worthy through trials that would kill ordinary mortals. Those who survive begin the implantation process, receiving the organs that will transform their bodies over the course of several years. They are indoctrinated in the Imperial Creed and taught the ways of war, their minds and bodies honed into perfect weapons of the Emperor.