Sword of Totsuka

The Totsuka Sword is a variant of the Sword of Kusanagi. Itachi Uchiha obtained and somehow incorporated it into his Susanoo along with the Yata Mirror to increase his offensive and defensive capabilities. Connected to a gourd held on the third arm of Susanoo, the blade appears to be made of pure chakra instead of having a defined form like the Kusanagi. It is an ethereal sword that has no physical form, a reason why Orochimaru never found it, despite searching for it for all his life.

Itachi has been seen using it to slash several targets at high speed, when he severed seven of the heads of the Eight Branches Technique with a single swing. The primary use of the sword is as a sealing device; whenever it pierces a target, it seals them into a never-ending genjutsu.