For more than ten years, the Khorsari Reach has remained beyond the Imperium's grasp, its territories overrun by the Death Guard's corrupted forces. Captain Ferren Areios of the Ultramarines Sixth Company undertakes a perilous mission to reclaim these worlds and avenge countless fallen civilians. His quest for retribution against Nurgle's servants tests the very principles that define his Chapter, forcing him to confront the moral boundaries of his sacred oath.