The wedding is saved and the Changelings are beat but Twilight is gone. She's been gone for 3 years and now an evil organization of advanced robots called "Treble" who seek to destroy Equestria has arrived. Trixie Lulamoon the new element of magic must help the others defend their home meanwhile Cadence believes Treble is somehow connected to Twilight's disappearance and will find her no matter what.

This is a continuation of the story of the same name by Dark Colt Sabata.
https://www.fimfiction.net/story/47701/grave