My Little Pony-Quest of Disharmony

After a miraculous event at the Summer Sun Celebration, curtsy of Twilight, an evil from ancient Equastria, a being named Undern Slate, awakens from 5,000 years of slumber and begins his quest to conquer all of Equastria, with the help of some old foes from the past and his dark relics; the Elements of Disharmony. Rest of summary inside.