Slaying Demon: Ōkami

Interfectum Malus: Ōkami has the shape of a nodachi. According to Continuum Shift, it is made of a metal that negates Ars Magus in a certain distance, explaining why Arakune can be killed by it in Calamity Trigger rather than regenerate after being hit by it. During the Teach Me, Miss Litchi!  episode, Ragna taunts Hakumen saying that it has yet to actually display its power.