Kokutō

The is a unique sword wielded by Raidō Namiashi. The blade is a katana with a darkened, non-reflective surface and is heavily coated in poison which Raidō usually uses to carry out his assassination missions. He used it in conjunction with Aoba Yamashiro's Scattering Thousand Crows Technique to conceal himself and the blade and successfully fend off Akatsuki member Kakuzu.