It is a period of civil war. Rebel spaceships, led by the former imperial Warmaster Horus, are beginning their campaigns against the corrupted Imperium of Man.
Against them, the nigh-immortal Emperor waits on his Golden Throne. Allied with him are the four Chaos Gods, eldritch nightmares thirsting for human suffering. The Space Marines, once the Imperium's finest soldiers, are divided. From his mighty warship, the Pride of the Emperor, Fulgrim leads his Legion towards ever-changing ideals of perfection. Meanwhile, in the galactic east, Roboute Guilliman, allied with the renegade Warmaster, constructs the core of a new galactic empire
Yet allegiances are far from set in stone, yet. Alliances both nominal and true will yet be tested. The philosophies of the rebels are as diverse as their personalities, but nowhere near as aberrantly divergent as those of the Chaos Gods - gods that demand more than lip service. Fulgrim's Astartes are beginning to understand as much, even if none of them understand their father. And Guilliman's mind echoes with the death cries of the Mining World Mortai's entire population.
The screams and pleas of the innocent will have no effect - not anymore. The age of debate and enlightenment is over. The dream of empire has ended.
The nightmare has begun.
