A New Responsiblity

Princess Celestia, Prince Solaris, Prince Artemis and Princess Luna decide to retire and hand off the ruling of Equestria to Twilight, Dusk and their friends. Meanwhile, the ancient villain Grogar bands together a legion of villains to conquer Equestria, but King Sombra and Queen Oscura has plans of their own and once they succeed Twilight, Dusk and the rest of the Mane and Colt Six struggle to come to terms with the destruction of the Tree of Harmony and the Elements, while King Sombra and Queen Oscura sets their sights to conquering all of Equestria.