Sword of Kurayami

The Sword of Kurayami was the personal weapon of Kazuto Ryūken, who inherited it from his father Daisuke Ryūken. It has a black blade and matching hilt, and was a larger size than a normal sword. It has repeatedly shown to be very durable and able to cut through various materials.

Kazuto could could expand on his sword's might by channeling his wind chakra into the blade with chakra flow, which would increase its sharpness greatly through high-frequency vibrations, as well as increasing its cutting range. This would allow Kazuto to cut through almost anything.