As everypony knows, there are only four powers in the forces of chaos; Khorne, Nurgle, Tzeentch and Slaanesh. The Imperium of Ponykind's finest soldiers - the Equitus Astartes, Arbitrotters, Mares of Battle and more - are all that stands between them, and total mayhem.

But what if that isn't the case? What if four ponies of Celestia's Most Holy Inquisition followed orders and found something that should never have been unearthed by ponykind, something that will turn everything they know about themselves completely upside down...?

A Warhammer 40K crossover story.