Piranha

Ruiga traps an enemy in an orb of water which is floating, Ruiga summons a school of piranhas which attack the trapped target slowly, but painfully.Ruiga uses this technique on a Flower ninja genius and Naruto.Naruto manages to escape death by the piranhas by comrades,the Flower ninja having been not able to use any jutsu effective to protect himself and having no immediate help, died.