MLP/Warhammer 30K crossover, Book #2 of an alternate Horus-Heresy path.

At the purgation of Davin, treasonous tongues and murderous hands attempted to cast mankind onto the pyres of damnation only to clash with a small group of Equestrian heroes. But the dangers have only begun to surface, and where one plot has failed, more emerge in their bid to plunge the galaxy in unending despair.

Dark machinations flourish and the future will not wait for the glacial pace of the mechanisms of power. Now, Primarch and Princess must decide the path which will shape the future for the sake of Equestria, and for all mankind. Sides are drawn and fractures appear that threaten to split the nascent Imperium apart; for it is the dawn of the 31st millennium, and the shadows are gathering.