After a thousand years have passed, Nightmare Moon finally returns to Equestria, only to discover the land has been taken over by a race known as the Caribou and has been turned into a land of sexual depravity!
Disgusted by the cruel treatment that the mares are forced to endure, she slowly begins building up her own rebel forces from the shadows, freeing and recruiting any black collars she can find while abducting and slowly purifying any red collars or corrupted stallions she can save, training them to become fearsome warriors under her command.
Soon after her small army grows bigger and stronger, she begins to wage war on the beasts that dare take her land as their own. The between the Nightmare Army and Caribou has begun, and while the strongest will survive, what of those caught in the middle?