The Dracocorn: Part 1

Once in Equestria, there was a revolt, against the ruler Celestia, by a group of ponies of which had, like nightmare moon, been taken over by shadow forces and their own bad intentions. A long with some dragon assistants they attempted to destroy Celestia. They failed and were banished to the Dark realm. The leader of the ponies, Dark Storm, promised that she will be back, with an even bigger army than before and a whole new race of ponies.