THE IMPERIUM OF MAN: an empire of a million worlds, it has stood for ten thousand years. But now the chaos gods are preparing for their final assault, and things older than gods are stirring in their sleep, and the Imperium is crumbling: sabotaged from within by mutants, heretics and witches; assaulted from without by the menace of the alien and the daemon.

Inquisitor Grimmus Darkium is a noble defender of humanity, in the hallowed Ordo Xenos. It is his duty to seek out new life and new civilizations - and destroy them before they become a threat to mankind. Through his extensive networks, and in no small part due to his own heroic ingenuity, the inquisitor has found what may be an existential threat to the Imperium.

Can the forces of the Imperium defeat the menace posed by these innocuous-seeming pastel-coloured equine xenos? More importantly - can Pinkie Pie keep her friend's surprise birthday party under wraps and make it the best night ever?