As the Emperor travels the galaxy at the head of his Great Crusade, few events are as important as rediscovering his scattered sons, the Primarchs, and bestowing them as the masters of their Legions. United, a Legion becomes a reflection of its Primarch, both in his strengths and his flaws. For the Twelfth Legion, once the War Hounds and now the World Eaters, the line between strength and flaw is almost impossible to separate.

It is the 31st millennium. Under the benevolent leadership of the Immortal Emperor, the Imperium of Man hasstretched out across the galaxy. It is a golden age of discovery and conquest. But now, on the eve of victory, the Emperor leaves the front lines, entrusting the great crusade to his favourite son, Horus. Promoted to Warmaster, can the idealistic Horus carry out the Emperor's grand plan, or will this promotion sow the seeds of heresy amongst his brothers?

In a bleak corner of the city of Valgaast, the House of Malveil awaits. A place of darkness, its halls throb with a sinister history. Its rooms are filled with malice. Its walls echo with pain. Now it stirs eagerly with the approach of an old heir - Colonel Maeson Strock of the Astra Militarum has returned home to his ancestral mansion. He is a man broken, both by the horrors of war and by personal loss, and he has come home to take up the mantle of Planetary Governor.

Of all the Emperor’s immortal sons, the primarchs, it is Konrad Curze whose legend is the darkest. Born in the shadows of Nostramo, a world of murderers, thieves and worse, is it any surprise that he became the figure of dread known only as the Night Haunter? Heed now the tragic story of the creature Konrad Curze, master of the Night Lords Legion, of how he became a monster and a weapon of terror. He who once served the Imperium saw the truth in a maddening universe and the hypocrisy of a loveless father, and embraced the only thing that made any sense - darkness. 

After seven years of bitter war, the end has come at last for the conflict known infamously as the Horus Heresy. Terra now lies within the Warmaster’s sights, the Throneworld and the seat of his father’s rule. Horus’ desire is nothing less than the death of the Emperor of Mankind and the utter subjugation of the Imperium. He has become the ascendant vessel of Chaos and amassed a terrible army with which to enact his will and vengeance. But the way to the Throne will be hard as the primarch Rogal Dorn, the Praetorian and protector of Terra, marshals the defences.

Long ago, the primarch Lorgar was humbled by his brother Guilliman for his belief in the Emperor's divinity. Led down a dark road by this shaming, Lorgar embraced Chaos. Now, he and his Word Bearers rampage across Guilliman's realm, burning his 500 worlds in the name of their new gods. But on such world, Lorgar finds a mystery that brings his past into the present and shines a new light on his endeavours. It seems that Lorgar's legacy may be greater than even he could have ever imagined....

Long before the coming of the Imperium, the realm of Ultramar was ruled by Roboute Guilliman, the last Battle King of Macragge. Even after learning of his true heritage as a primarch son of the Emperor of Mankind, he strove to expand his domain as efficiently and benevolently as possible, with the XIII Legion Ultramarines as his alone to command.

The scattered worlds of the Elara's Veil nebula were once protected by the oath of unity sworn by three mighty Chapters of the Adeptus Astartes. The Star Scorpions were undone by flaws in their genetic coding. The Celestial Lions were ravaged by the Inquisition for sins they did not commit. Now, after hundreds of years, only the Emperor's Spears still keep their vigil. They are barbarian watchmen against the Outer Dark, bloodied but unbroken in their long duty.   

The 33rd Grand Battalion of the Iron Warriors, newly raised and seeing battle for the first time, have the honour of the primarch himself, Perturabo, leading them. But the Hammer of Olympia is there for more than just battle - he is evaluating his new officers and deciding their fates. And with a force of Imperial Fists allied to their cause, Perturabo sees the perfect opportunity to teach his new warriors the difference between the stone of the VII Legion and the Iron of his own.

The Night Lords were once among the most potent forces of the Imperium, Space Marines who used fear itself as their weapon. Now, cast adrift from the Emperor's light and hunted as heretics after their monstrous betrayal, the Night Lords clad themselves in symbols of death and fight the Long War, bringing pain and terror to all who worship the corpse-god of Terra. A summons from Warmaster Abaddon sends these rebels on a dangerous journey that leads inexorably to a conflict with the Emperor's chosen warriors, the Blood Angels.