Sword of Totsuka

The Sword of Totsuka is the opposite of the Sword of Kusanagi (Orochimaru) which Orochimaru uses, and Itachi Uchiha obtained it and somehow incorporated it into his Susanoo along with the Yata Mirror to increase its offensive and defensive capabilities. Connected to a gourd held on the third arm of Susanoo, the blade looks like its made out of pure chakra instead of having a defined form like the Kusanagi.

Itachi has shown he can use it to slash several targets at high speed, like when he severed seven of the heads of the Eight Branches Technique with a single swing. Though the primary use of the sword is to seal targets, whenever it pierces a human being, it seals it and puts it into a never ending genjutsu.