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Chaplin Cassius and the Ultramarines defend the heart of the Imperium against the most dangerous of enemies--the bio-engineered horrors of the hive fleets.

In the 41st millennium, the human Imperium must fight a constant battle for survival against the myriad enemies who seek to destroy it. At the forefront of this battle stand the Space Marines, genetically engineered superhumans whose sole purpose is to fight--and win. When a tyranid hive fleet is detected dangerously close to the Sol system, two entire companies of Ultramarines are sent to find and destroy the aliens. Led by their legendary Chaplain, Cassius, the Ultramarines must stop the tyranids, no matter the cost.

With typical bravery, courage and honour, the Ultramarines set about their task, but faced with impossible odds, and Cassius's impetuous nature, victory is far from certain.

Supreme Grand Master Azrael of the Dark Angels is forced into an uneasy alliance with the eldar to keep his Chapter's secret past safely buried.

The Dark Angels Chapter sprang from the First Legion of Space Marines to fight and die at the Emperor's side. But over ten thousand years, even the most staunchly loyal warriors of the Imperium can fall from grace, and the Dark Angels guard their own murky secrets most carefully - only Supreme Grand Master Azrael knows them all. A legend among Space Marines, he has fought for centuries and ever at the forefront of battle.

Now, with the enigmatically alien eldar as his uneasy and unlikely allies, he must tread the fine line once more between the pursuit of victory, and keeping the Chapter's past safely buried...

Across many campaigns, Kayvaan Shrike of the Raven Guard pursues his nemesis, the ork warlord Gorkrusha.

Vaunted warrior of the Raven Guard, Shrike has ascended the ranks of this most mysterious and deadly brotherhood all the way to Chapter Master. He is a legend amongst his battle-brothers, one that began humbly enough in the wilds of Kiavahr. Shrike has fought and bested many foes, but one in particular, the Ork Warlord Gorkrusha, dogged him throughout many campaigns.

From veteran to Shadow Captain, Shrike clashed with his old nemesis time and again, determined to bring about a final reckoning and bloody vengeance to the greenskin.

Lemartes, the Blood Angels' Guardian of the Lost, leads the Death Company into battle on a world gripped by a blood-madness that reflects his own tortured soul.

Lemartes is the Guardian of the Lost, a Space Marine warrior who balances on the edge of madness, ever close to falling into the grip of the Black Rage, the secret curse of the Blood Angels Chapter. When he is awakened to lead the Death Company into battle on the war-wracked world of Phlegethon, Lemartes must battle his incipient madness as his forces clash with equally insane foes: the blood-crazed servants of Chaos.