The Sword of Bone is a powerful weapon wielded by an agent of the Vishanti known as the Fist of Agamotto, the Pale Horseman, or as Cadaver. The blue aura allows the blade to penetrate things that usually are impenetrable. On one occasion the Sword of Bone even damaged the Hulk. The Sword of Bone has a mystic connection to the Pale Horseman. In fact the Horseman summons the Sword by reaching into his ribcage and tearing out one of his own rib bones, which magically transforms into the Sword of Bone.