The Storm Serpent is a new Storm-attribute Box Weapon as of the Future Arc. One of the Box Weapons used by Baishana, his in specific is based on a U.M.A. called a Tsuchinoko. Due to its relation with the mysterious creature, Hayato Gokudera became excited when he first saw it during the Merone Base invasion. In response, Ryohei Sasagawa commented that a real one had been discovered three years prior.