Cursed Seal Device

These devices are embedded with a juinjutsu created by Tosaka, which bestows the wielder heightened abilities, capable of making an individual with no ninja training strong enough to defeat those of a genin rank or higher. Tosaka claimed his device (created from the data on Jūgo ’s Sage Transformation ) to be the “ultimate Cursed Seal weapon”, prior to his utter defeat from Jūgo’s complete transformation.