Blaze Release: Kagutsuchi

This technique applies Shape Transformation to the black flames of Amaterasu, allowing the user to manipulate them at will. While Amaterasu is cast from the user's left eye, he uses his right eye to manipulate the flames. Sasuke also generates black flames from his palms or bones of Susanoo.

Variants
The user can shape the flames of Amaterasu in different varieties, for both offence and defence.
 * Converging the flames in front of the user, a barrier of spike-shaped flames can be created not only shields him, but also burns and pierces any opponent that touches it.
 * The flames can be wielded in his own hand without being incinerated, and can be manipulated into a flexible sword, 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 was initially identified as "Blaze Release: Kagutsuchi" in the manga, it was later named as part of a derivative technique called "Blaze Release: Susanoo Kagutsuchi". And 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.