Yamārashi

A sword that was Hand crafted by the the Rikudo Sennin himself He designed this blade from the power of the Juubi itself to go against the power of the tail beast, Due to teh incident Fa' rao caused so many years ago act of insolence. This blade imbues the user with tremdnous power as it allows you to fight on the level with a tailed beast. The immense power that this sword gives is enough to make think they are immortal as the power of the sage protect he who wields this blade. Once the person wields the sword it Assmilates with the user and it can be wielded as it now share feeds off you life force. If your life force is insuccficent it will simply close its hilt and remain lifeless until one who is worth crosses its path. If the user is acceptable to the blade the user must feed it the lifeforce of other enemies or it will slowy eat away at your psyche,corrupting you to its infleunce as well as eventually killing the user as it was built from the foul chakra of the ten tailed beast as well as the power of the Rikudo Sennin Himself. This was one of the Sage of the Six paths most powerful weapons in his time.