My Little Pony Nightmare Knights

Equestria's in danger! Powerless and threatened by a great evil, Princess Luna discovers she can't count on her sister or any of the usual heroes of Equestria. Running out of time and with nowhere to turn, Luna assembles a team specially suited to save the day... made up of former villains! Will Luna, Capper, Tempest Shadow, Trixie, and Stygian all be able to work together and find a way into the most dangerous place any of them have ever been?