"We did," the Curator said sullenly. "Our first, but not last failure. The principal was simple, create something that could remove the negativity from the world, making it harmless, which we did. Unfortunately we kept the windigoes in a rather bestial state, and all they knew was hunger. They were ravenous, and proved to be more of a danger than a benefit, so were banished to the frozen north and kept there by Faust's power. It's somewhat ironic that in the end it was the windigoes that brought ponies together."