Blaze Release

is an advanced chakra nature kekkei genkai of the Uchiha clan, that allows them to manipulate black flames. Sasuke Uchiha uses this nature when manipulating the unquenchable black flames of Amaterasu, fashioning them into various weapons and defences. 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. This Kekkei Genkai is unique in the fact it doesn't combine two elements but rather it simply applies Shape Transformation to Amaterasu, making it more useful for adapting to different situations.