three demons, cataclysm, despair, and pestilence: everyone knows them in some way. they are hells enforcers, and punish those who have fallen out of favor. none of them figured that a portal would open up and send them to equestria. as the months roll by they eventually learn to live with these happy creatures who go against everything that they ever knew. and they find apprentices in three cutie mark-less fillies. too bad an ancient enemy has a few things to say about that.