The Imperium fights in a time of constant war: there are countless threats to humanity’s continued survival, and more arise every day. Heretics and mutants infest the most populous hive planets, spreading their evil in dark places far from the Emperor’s light. Xenos races attack from every edge of the galaxy, expanding their foul empires and mocking the order and justice that flows from the Emperor’s throne. Yet perhaps the greatest war is the war that must be fought in secret, against the Daemons and the powers of Chaos that live within the Warp. Mankind uses the Warp daily for both travel and communication; if the true nature of the Warp and the beings that dwell within were to become known, civilization would surely descend into anarchy.