The titular electric power of Nightmare is his power to surface in desires, either before the sufferer had encountered him inside the flesh inside a kind of unwell omen or while in the minds of survivors after a terrifying assault. He can shift towards the astral and ethereal planes. https://nanobookmarking.com/story19700216/the-smart-trick-of-nightmare-mu-online-season-20-that-no-one-is-discussing