uring the 36th millennium, the Imperium of Man was beset by a religious civil war. The insane tyrant Goge Vandire usurped control of the Imperial bureaucracy and plunged the Imperium into its bloodiest period since the Horus Heresy.

The Wars of Faith raged for seven decades and millions died during the religious paranoia and brutal repression that occurred on all sides. Soon, a rebellion formed around a charismatic orator known as Sebastian Thor. He swayed countless worlds, and eventually the Space Marines and Adepts of Mars joined him. Together, they sieged the Ecclesiarchal Palaces and ended Vandire's Reign of Blood.