While the Ultramarines reel from Kor Phaeron's surprise attack on Calth Lorgar leads the rest of the Word Bearers deep into the realm of Ultramar. Their unlikely allies Angron & the World Eaters seem blind to the true goals of the mission preferring instead to ravage each new civilisation they come across
- but where Lorgar might once have chastised his wayward brother now he seems only to encourage the frenzied bloodletting. Worlds will burn Legions will clash & a primarch will fall...and the fate of the entire galaxy hangs in the balance.