On Hearthswarming Eve in a dark alternate Equestria - engaged in a crusade to 'purify' the worlds of ponies and humans alike - Queen Celestia sends out an assassin to eliminate Sint Erklass, the Spirit of Hearthswarming and her own adoptive father.
Having captured Zecora and the rebels, Queen Chrysalis brings her captured enemies back to Canterlot for punishment. Her own peculiar, twistedly comical brand of punishment.