Abaddon returns from exile and raises the dreaded Black Legion. The Sons of Horus may be no more, but rising from their ashes come the Black Legion. Returning after his long self-imposed exile, Abaddon offers the disparate Chaos Space Marine warbands within the Eye of Terror a simple choice - join him or die. As his newborn war host emerges from the Eye of Terror to ravage the galaxy, none can stand in Abaddon's path, not even the Black Templars Chapter - sworn to stand guard at the storm's edge - nor the Emperor's Champion himself.