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.
 * Defensive Use: Sasuke can cover the ribs of Susanoo with the flames, surrounding himself with a shield of black fire. In addition to the damage it can inflict, this has the psychological effect of causing melee enemies to hesitate to attack him. It named by Karin . He can also create spike-shaped flames that not only shields him, but also pierces any opponent that touches it.
 * Offensive Use: 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.