Across mankind's Imperium, battle rages. From the lowly troopers of the Imperial Guard to the elite Space Marines, humanity's defenders are ever beset by threats. Alien races encroach on the edges of mankind's realm, bringing worlds to ruin with blade, gun and claw. On countless worlds, mutated servants of dark gods seek to do their masters' bidding and bring ruin to all that the Emperor sacrificed himself to build. And in the nightmare realm of the Eye of Terror, the archtraitors who tore the Imperium apart ten millenia ago still lurk, plotting their revenge...

In the grim darkness of the far future, there is only war.