Shisui(止水 or Shisui, literally "Stagnant Water") is one of the five legendary, long lost, centenerian katanas that were found, and currently owned by, Takao Fujitate. Albeit having the katana, it's little more than a sword to Takao, due to the fact he can't mold water natured chakra and, due to that is unable to use it the way it was meant to be used. Shisui represents its land of origin, the Land of Water.