Several years ago, dinosaurs suddenly appeared in Equestria, taking over the landscape. The ponies grew walls of trees around their cities for protection, forced into hiding inside. And it worked, until…that day…

Suddenly, dinosaurs with elemental powers began appearing inside the city walls, transformed from ponies themselves! But can this dino-shifting power also be used to defend the ponies? Which heroes will rise to use it? And what does all of this have to do with several curious stones unearthed only months prior to the dinosaurs' first arrival?

(My Little Pony, Dinosaur King, and Attack on Titan walk into a blender.)