Restia Ashdoll

Restia is Kazehaya Kamito's contracted spirit, She is a high level darkness elemental spirit in the form of a young girl. In elemental waffe form, she transforms into a jet-black demon sword known as «Vorpal Sword» - the sword that pierces truth. She is capable of transforming herself to sword form on her own and being wielded by others without the need to form a contract.