Anti-Magic

Not a magic but its negation. It comes from Asta's five-leaf grimoire and erases any spell it touches.

Anti-magic cannot be cast, sensed or absorbed: precisely because Asta has not a drop of mana, Liebe's power passes through him unfiltered. The grimoire's three swords — the Demon-Dweller, the Demon-Slayer and the Demon-Destroyer — are the only way to aim it, and the only weapon that truly wounds a devil.