Cobalt Powder (鈷粉, Kokona, Literally meaning Cobalt Powder) is the name of the weapon used by Seisa, in combination with his Magnet Release kekkei genkai. In sufficient quantity, Cobalt Powder can be used for a diverse amount of techniques, which Seisa used to form needles, a sword, or as a shield to intercept hostile attacks. Seisa has also been shown to magnetize a large amount of Cobalt Powder by forming a pillar of it to attract metallic weapons used by opponents.