Nightmare Forces

The Nightmare Forces are villains from My Little Pony: Friendship is Magic. They fully appeared as a group in the comics.

The Nightmare Forces are responsible for turning Princess Luna into Nightmare Moon, and Rarity into Nightmare Rarity.

They are primarily lead by Shadowfright when a host wasn't found yet. They are composed of rabbits, cats, wolves, bats, and Nightmare Soldiers.

The Search for Rarity
The Nightmare Forces serves as the secondary antagonist of Acts II and III. During Act III, the Nightmare Forces served The Didact and his Prometheans.

Season 7
The Nightmare Forces serve as the main antagonists of Season 7. They serve as the archenemies of the Brotherhood of Steel.