FoE/Fo:E

Fucking, Fucking never changes,

There came an era where the ideals of friendship gave way to conquest and sexual desire. Caribou full of selfishness and war mongering made Equestria their new homeland overthrowing the female monarchy. Their magic corrupted many stallions and mares with the goal of suppressing the female sex. They soon turned their sights on their neighbors. Regardless the end of the world occurred plunged into an abyss of balefire and dark magic.

But it was not the end, just the start of a new bloody era, The Caribou had order the construction of underground structures called Kennels. A place to store their enslaved females for use of a few nobles well they can wait out the destruction and emerge later into a new world. Except for Kennel Two which never opened.