AUTHOR'S NOTICE: This is an R-Rated cut of the original Demon Holocaust story. The more graphic parts of the original have been cut, or heavily edited in this version.

This story takes place in an alternate universe of Friendship is Magic, in between season 3 and 4.
Possessed by the strongest demon to ever come out of Tartarus, a unicorn goes on a rampage, the demon within determined to take over all of Equestria.

Original unedited version can be found here:
Demon Holocaust

Suggested official rating: R for strong sexual content including rape, and for disturbing graphic violence and gore