The Blood Angels Chapter of Space Marines is under threat. Having obliterated all human life in the Red Scar region of space , the largest tendril of Hive Fleet Leviathan ever seen in the Imperium has converged and is making relentlessly for Baal.
To face this awesome foe, Commander Dante has called upon the Successor Chapters of the ancient Ninth Legion. The Sons of Sanguinius gather in numbers not seen since the dark days of the Horus Heresy. Thirty thousand Space Marines stand ready to thwart the Great Devourer, save the home world of their pirmarch, and prevent the consumption of billions in the Ultima Segmentum beyond.
But the tyranid swarm numbers in the trillions, and they are not the only danger to the Chapter's future. As the galaxy slides towards a terrifying new era, events far away threaten to unleash a greater evil. A further enemy must also be overcome, that of the Black Rage that lurks in the souls of all Sanguinius' bloodline.
Can Dante, among the greatest of humanity's heroes, stem the unstoppable tide? Or will his long reign as Chapter Master end with extinction? Should Baal fall, the Imperium will be dealt a blow from which is might never recover.