User blog comment:IamJakuhoRaikoben/Chapter 356: Tartarus Arc, Review./@comment-5343732-20131019064909/@comment-8153438-20131019215311

Just like Dragons teaching Dragon Slaying Magic to humans to kill other dragons. It must be demons, learning Demon Slaying Magic to kill his fellow demons.. In short, techniques or spells capable of killing even Demons.