Fire Release: Intelligent Hard Work


 * Name: Katon: Zukokku, 火遁・頭刻苦, literally "Fire Release: Intense Pain"
 * Type: Unknown
 * Users: Kakuzu

After releasing the Lion mask from his back, it can release a giant sea of fire that incinerates everything in its path. Not much is said how he learned this technique or not, but much is known that he obtained it wile in Akatsuki.