Blaze Release

is an advanced chakra nature kekkei genkai of the Uchiha clan, that lets them manipulate black flames. Sasuke Uchiha uses this technique when manipulating the unquenchable black flames of Amaterasu, fashioning them into various weapons and defences. This nature also allows the user to extinguish these flames. After entering its final form, Susanoo gained an orb of black flames, which serves as an alternate source of flames to manipulate with this nature.

C stated that Sasuke manipulates the flames with his right Mangekyō Sharingan whereas he casts Amaterasu with his left. It is unknown what element(s) this nature entails aside from Fire Release which makes up Amaterasu.

Trivia

 * Tobirama Senju has stated that Sasuke Uchiha's Kagutsuchi was the strongest he's seen, making it evident that there was an Uchiha who used it during his time period.