My Little Pony: Friendship Is Magic, Vol. 17

Celestia and Luna ascribe Equestria’s latest age of peace to the good work of Spike and the Mane Six. As such, the alicorn sisters have decided to retire and pass the crown to Twilight. But Twilight has huge doubts that she’s ready for a responsibility of that magnitude – concerns exacerbated by the reappearance of the ancient villain Grogar and his cabal of Sombra, Tirek, Cozy Glow, and Chrysalis. When the villains destroy the Tree’s Elements of Harmony and launch a greater plan to rule Equestria, Twilight and her friends must overcome their darkest doubts and draw on the friendships they’ve built throughout nine seasons, to rise to their rightful place as Equestria’s leaders.