Set one-billion years in the future, the children of Celestia, Luna, Cadence, and Twilight rule the new generation of Equestria. The descendants of the Mane Six served as the guardians of Equestria while the heirs learned the ways of magic, but one day, they disappeared without a trace. The young heirs decide to form new elements, just in case something happens, but things don't go as expected. On top of that, they stumble upon a magic mirror and Equestria is put in danger. If the new elements don't stop the evil from spreading, Equestria could fall. Forever.

(Teen for some violence)