Twilight Sparkle is about to be crowned ruler of Equestria, but on this day of all days, the peace is disturbed by the ultimate threat: Emperor Grogar and the Horses of the Apocalypse.
Desperation can tarnish the noblest intentions, especially when dealing with forces beyond our understanding. And as incomprehensible as they are, so is their price.
While Chrysalis, Tirek and Cozy Glow try to figure out how to activate the bell, Grogar sets out to the Castle of the Two Sisters to confront the spirit of the Tree of Harmony.
You might know Gusty the Great due to the fairytale, but there´s so much more to her than the book tells you. This is the origin story of the insecure mare that ended up freeing all ponies from Equestria´s greatest villain.