is a part of the black bulls. he pulls out his grimoire he can pull out two types of swords, sometimes dual wielding both. Demon-Slayer Sword: This is Asta’s first sword. It's a large, broad sword that can cut through magic and deflect spells. Demon-Dweller Sword: This sword can cut and borrow the magic of others. When wielded by Asta, who has no magic, it uses anti-magic to cut through spells.