A Katana forged using an unknown black material, from its blade to even the hilt. It deals 55 base damage. The weapon radiates of white Chakra. It also grants the user +3 Chakra when equipped and restores their Chakra over a short period. You need a minimum of 100 Strength, 40 Chakra, and a level of 59 or above to utilize this weapon. You can obtain it by defeating Admiral Mitsuhide on the 3rd Floor of the Iron Tower, found at the heart of Iron City, which is in the Land of Iron.

The damage of this weapon scales with the Strength Statistic.

Credits to @D E M O N for the info.

In-Game Look