Flame Style: Kagutsuchi - a dōjutsu that applies shape transformation to the black flames of Amaterasu and allows the user to control them at will. Sasuke Uchiha creates Amaterasu with his left eye, and with his right eye gives the flames any shape, turning the incinerating fire into a flexible tool of defense and attack.
With Kagutsuchi, the black flames can be molded into a barrier of sharp spikes in front of the user, which pierces and burns anyone who touches it. When Susanoo's ribcage is activated, the flames cover the bone segments, creating a blazing defensive sphere. The user is also able to hold the fire in their hand without harm, form it into a flexible sword that launches projectiles with a swing, or wrap the flames around an ordinary blade, greatly enhancing its destructive power. If necessary, the flames can be added to Chidori, making its strike even more devastating. All these forms are under the direct control of the user and serve both offense and defense.
