Blaze Release

is an advanced chakra nature kekkei genkai of the Uchiha clan, stated to be the highest level of Fire Release, that allows them to produce black flames known as Amaterasu and manipulate them. Sasuke has gone as far as to manipulate the unquenchable black flames, fashioning them into various weapons and defences. Upon entering its armoured form for the first time, Sasuke's 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.