Shichiseiken

The Shichiseiken is a broad, flat sword that was said to be used by the Sage of the Six Paths himself, and is one of the Five Ultimate Treasures. As with the other four treasures, it's usage consumes a large amount of chakra, so much so that a normal human will die in no time.

The sword, along with three other treasures, were gathered by Kumogakure, and eventually fell into the hands of the Gold and Silver Brothers, who possessed a portion of the Nine-Tailed Demon Fox's chakra, and as such were able to wield the treasures without repercussions.

The sword can be folded down the middle. It is used to sever the souls of the enemy after it has been drawn out by the Kōkinjō. The word the person whose soul has been severed most frequently says will appear on the blade also.