Set before the events of Friendship Is Magic.

Each pony tribe had made peace with the others, banishing the deadly Windigos into the pits of Tartarus, never to be released upon the world. Calm spread throughout the land, and each mare and colt could finally be safe.

But nopony expected the Windigos to use the last of their power to leave a dark curse upon the ones who had defeated them. The mares were lost, the curse taking control and leaving them to what they believed were the hooves of death.

Or so it seemed.