King Sombra wants his old empire back, but he's become weak and needs to feed. He looks for help, and what he does is unexpected. He finds Princess Luna and re-corrupts her to return to Nightmare Moon, brakes Discord from his stone prison, gives Trixie back the alicorn amulet, and finds Queen Chrysalis and her changelings. They go to take back The Crystal Empire as a team. This is so the six friends can't stop all of them together. After they take back Sombra's Empire they decide to take all of Equestria, and what happens will make all of Equestria's history change.
Big Thanks to nygiants93 and OctavianRex