An application of
Kagutsuchi through Susanoo, whereby Sasuke produces weapons made from the black flames of Amaterasu using the black orb held in his Susanoo's secondary right hand.
The black flames can form a sword to be wielded by Susanoo, which is able to stab and slice through individuals or defences, incinerating whatever remains. 
 Magatama-shaped projectiles can be unleashed from the orb in volleys, knocking back and subsequently incinerating their targets.
 This technique can produce arrows, which can then be utilised with Susanoo's bow.
In , the sword version is named " Naruto Shippūden: Ultimate Ninja Storm 3 Sword of Kagutsuchi" (加具土命の剣, Kagutsuchi no Tsurugi; Literally meaning "Added Tool Earth-Lord Sword").
When portrayed in the anime, the Susanoo Kagusuchi blade — and the orb it holds — appears to be made of the same ethereal substance as the rest of Susanoo, and not Amaterasu as it appears in the manga and games. Instead, it changes into black flames when using certain techniques. 
Naruto chapter 585, page 7
Naruto chapter 634, page 8
Naruto chapter 574, page 10
Naruto chapter 634, pages 11-12
Naruto: Shippūden episode 326 ↑
Naruto: Shippūden episode 331