This is from the anime called black clover its. So your theory is not even close enough. Asta S Demon Form Finally The Transformation We Were Waiting For This form of energy allows the user to nullify other forms of magic. Black clover demon form . Demon from astas 10 most powerful techniques ranked. 5 leaf grimoire animereview asta demon form aura awesome black bulls black clover blood controlling magic darkness demon diamond kingdom episode 63 eye of the midnight sun fana fighting finral friends guess who is back humour intense lardos magic multi dimentional slash music nature spirit noel queen of witches roar of the sea. So that dosent mean that asta has a devil inside him means he is evil. Anti magic anchi maho is an energy that is capable of nullifying other forms of magic. In what chapter in manga he gets the demon form. Anime balls deep 409150 views. It stems from the devil connected to astas grimoire.