Sword of Kagutsuchi

By applying shape transformation to the orb of black flames wielded by his Susanoo, Sasuke manifests a blade in its hand for the purpose of slicing and piercing targets, thus setting them ablaze with the inextinguishable flames of Amaterasu.

Trivia

 * In chapter 585, Sasuke simply referred to this technique as Blaze Release: Kagutsuchi. However, in Naruto Shippūden: Ultimate Ninja Storm 3, it was given a unique name.

Espada Kagutsuchi