The Emperor personally leads the Great Crusade across the stars, and nothing is more important to the Master of Mankind than to find his sons scattered across the galaxy: the Primarchs, each destined to lead a legion of Space Marines. After reunification, any such army becomes a reflection of its master - both his virtues and vices. For the XII Legion, former War Hounds and now World Eaters, the line between virtue and vice is barely discernible. Burdened with a warrior that is alien to him, in the service of a father he hates, Angron confronts his sons with a difficult choice - a choice that will turn the legion on a one-way path. What would warriors who desperately want their father's recognition prefer: to be reborn in his mutilated image or to resist him? And will the true purpose of the primarch in the Emperor’s plans be revealed to them?