A razor sharp katana designed for speed, durability, and unparalleled sharpness. Crafted from a metal known as Jin'sei and mixed with diamond dust during the forging this blade has been seen to cut cleanly through blades of steel. The entire katana has diamond dust throughout; meaning even the flat of the blade can easily cut through skin and scratch a diamond. Forged in the black flames used by Kyūketsuki, this blade reflects light so brightly as to have been compared to a highly polished diamond and its durability has shown to hold the same standard. This is the sword Kyūketsuki used most often for his Thousand Amber Blades blade-style.