Demon Surge (魔幻の波動 Magen no hadō, lit. Wave of Illusion) is a monster-only spell from Fire Emblem: The Sacred Stones, and is primarily used by Gorgons. When cast, this spell will engulf the selected enemy target and entrap him/her within a menacing orb of darkness. Forks of nefarious lightning will then cascade down upon the target, transforming the orb into a wicked tornado that swirls around him/her before rupturing.
When obtained through the enemy control glitch, this spell may be used by any unit, regardless of whether they are physical or magic-based. However, only magic-based units will display battle animations when casting the spell.