Blaze Release: Kagutsuchi

Sasuke Uchiha uses this technique to apply Shape Transformation to the inextinguishable black flames of Amaterasu, manipulating them at will. While Amaterasu is cast from Sasuke's left eye, he uses his right eye to manipulate the flames. After entering its final form, Sasuke's Susanoo gained an orb of black flames, which serves as an alternate source of flames for Sasuke to manipulate with this technique.

Variants
Sasuke shapes Amaterasu in different varieties either for offence or defence.


 * Sasuke can create a barrier of spike-shaped flames that not only shields him, but also burns and pierces any opponent that touches it.
 * After obtaining the Eternal Mangekyō Sharingan, Sasuke demonstrated use of Kagutsuchi to form a weapon from the orb of black flames wielded by his Susanoo, which he used to stab White Zetsu, slice through Kabuto's Spider Web Unrolling technique with relative ease, and damage the Ten-Tails once combined with Naruto's technique.
 * Sasuke is also shown to be able to wield the flames like a flexible sword in his own hand without being incinerated, as well as fire spike-shaped projectiles from the blade for a long-ranged attack.

Influence
Similar to other Mangekyō Sharingan abilities, Kagutsuchi's name is derived from Japanese myth and religion. Kagutsuchi is the God of Fire in Shinto and the one who brought death into the world by burning his mother Izanami to death as she gave birth to him. This made his father, Izanagi, kill him with the Totsuka sword.

Trivia

 * Although the sword version utilised by Susanoo is simply called "Blaze Release: Kagutsuchi" in the manga, in Naruto Shippūden: Ultimate Ninja Storm 3, it is named.
 * In chapter 585, the furigana of this technique's name were written in hiragana, not in katakana, as they're usually written.