User blog comment:B214/Talk About What You Want! 3/@comment-24098614-20141112111146/@comment-1359322-20141112112337

First there's no such thing as Demonic Magic. Demonic Powers and Magic are two completely different things.

Second, Issei can transfer the Dragon Slayer aura to his Demonic Power, he used an Ascalon powered Crimson Blaster in his fight against Crom Cruach.