A threat looms over the Space Marines of the Blood Angels Chapter. Having exterminated all the people in the Red Scar region of space, a gigantic tentacle of Hive Fleet Leviathan, the likes of which have never been seen before in the Imperium, advances mercilessly towards Baal. To confront this terrible enemy, Commander Dante called on all the successor orders of the ancient IX Legion. The sons of Sanguinius gathered together in a way not seen since the dark days of the Horus Heresy. Thirty thousand Space Marines are ready to stand against the Great Devourer to save the homeworld of their primarch and prevent the consumption of billions of lives in the Ultima Segmentum that lies beyond it. But the Tyranid swarms number in the trillions, and they are not the only danger that awaits the order. The galaxy is rapidly moving towards a terrible new era. Events are unfolding in the distance that threaten to unleash a great evil. The descendants of Sanguinius also have another enemy - the Black Rage, which lurks in the soul of each of them. Will Dante, one of humanity's greatest heroes, be able to hold back the raging tide? Or will his long reign in the order end in disaster? If Baal falls, the Imperium will be dealt a blow from which it may never recover.