Anti Magic 「魔法 Anchi Mahō」 is an energy that is capable of nullifying other forms of magic. It stems from the devil connected to Asta's grimoire.
This form of energy allows the user to nullify other forms of magic. In order to use it to its full potential, specific tools are required, which are stored within grimoires.
Anti Magic naturally opposes any mana and magic, so only someone without any magic power can wield it. However, its magic-nullifying properties have been added onto other types of magic through special circumstances.
Additionally, Anti Magic cannot be copied by Imitation Magic but can be duplicated by Mirror Magic.