Permafrost

Permafrost Bite is an Equestrian Windigo from ancient prehistoric times when the Alicorn Gods were experimenting mortal creations and created sentient prehistoric mammals including the famed wooly mammoth. But Permafrost was a sadistic merciless tyrant who saw mortal non-elemental creatures insignificant and worth nothing more than food, and doesn't care an inch for their suffering. But when his rule is threatened by more merciful and completely honest candidates, he swears to prove he's the only worthy ruler. He does this by starting a race war amongst all the creatures of the era, thus making them hate each other, giving his people a lifetime global supply of food and even solving their world hunger crisis, thus causing the First Windigo Ice Age. He even murders the other candidates when they try to expose what he did. But they are revealed when the races seemingly go extinct, and thus he was turned into underground permafrost as punishment. He has remained in this prison ever since, but when he discovers they survived underground since his time when he is accidentally released in the biggest underground homeland of Paleopotamia, he swears to finish the job as revenge for his imprisonment, as he chases all the underground prehistoric creatures out to the surface by freezing anything and everything around him, and the only thing keeping him from escaping is the Lascaux Catacombs, a complex of underground caves patterned with cave paintings where most of the prehistoric creatures lived and survived his influence that is a labyrinth almost impossible to escape, and it's up to some heroes to stop him before he surfaces and uses a recent blizzard scheduled by pegasi to create a Third Ice Age.