Sword of Totsuka

The Sword of Totsuka is a variant of Orochimaru's Sword of Kusanagi. Along with the Yata Mirror, the Sword of Totsuka is a weapon carried by Susanoo that exists only in the user, being made up of chakra. Contained in a gourd held by Susanoo's third fore arm, the blade is actually the liquid inside the gourd that is released and shaped, rather than a conventional sword.

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 several swings.

This sword can also function as a sealing device. When a target is pierced by this sword, the user need only draw them back into the gourd that serves as a hilt which will keep the victim(s) sealed in an eternal genjutsu, as seen during Itachi's final battle against Orochimaru.

Trivia

 * Orochimaru searched for this sword for all his life, but could never find it due to it existing in spiritual form.
 * The sword has been popularly mistranslated as a "perfect counter to the Kusanagi".