Windigos

The Windigoes are spirits that that feed off hatred and fighting. The more hate the sprit feels the colder things become. They appeared in My Little Pony Friendship is Magic, in a season 2 episode, Hearth's Warming Eve and they served as the main antagonist's despite the short role in the episode. In the end they are defeated by "the fire of friendship" a pink flame that takes the shape of a heart, after Clover, Smart Cookie, and Pansy becoem friends. However there are still around, as Rainbow Dash and Applejack started to argue.