Sword of Kusanagi (Orochimaru)

The Kusanagi Sword is the Kusanagi of Japanese legend. Orochimaru retrieves his Kusanagi by opening his mouth and extending a snake which then opens its mouth and produces the sword. Orochimaru was seen producing the sword handle first so he could use it freely, or blade first to attack his opponent instantly.

The sword can extend its blade to attack from long distances, levitate in the air according to Orochimaru's command, and it can cut through almost anything. Even Enma, who is able to transform into a diamond-hard staff, stated that the Kusanagi blade could damage him considerably. It should be noted that Orochimaru's Kusanagi could not pierce Naruto Uzumaki's four-tailed form. The sword has been seen transforming into a small snake and returning to Orochimaru.

After Orochimaru reemerged from Sasuke Uchiha through his Eight Branches Technique, he was sealed by Itachi Uchiha's Sword of Totsuka; the Kusanagi was sealed as well.

The Kusanagi appears differently from the manga to the anime. In the manga, the Kusanagi looks more like a standard katana, while in the anime it is a double-edged jian.

Influence
The Kusanagi no Tsurugi (草薙劍; Literally meaning "Grass Cutter Sword") is one of the Three Imperial Regalia of Japan (三種の神器, Sanshu no Jingi), together with the Yata no Kagami (八咫鏡; Literally meaning "Eight Span Mirror") and the Yasakani no Magatama (八尺瓊曲玉; Literally meaning "Eight Shaku Curved Jewel").

Trivia

 * Sasuke Uchiha refers to the chokutō he carries as a "Sword of Kusanagi", but it carries none of the unique attributes that Orochimaru's does.
 * The Totsuka Sword wielded by Itachi Uchiha's Susanoo is also said to be a "Sword of Kusanagi", although this has been popularly mistranslated as it being the perfect counter to the Sword of Kusanagi.