Shusui

Shusui is a black sword in the One Piece universe that is one of the three swords wielded by the pirate Roronoa Zoro. It is a legendary sword that was once wielded by the samurai Ryuma, who is said to have slayed a dragon with the sword.

Shusui has a distinctive black blade with a white hilt and a circular guard that features a design resembling a chrysanthemum. The sword is known for its exceptional sharpness and durability, and its unique design makes it stand out among other swords in the series.

In battle, Shusui is a powerful weapon that Zoro can use to take down even the strongest opponents. Zoro is able to use the sword to perform a variety of powerful attacks, such as the "Oni Giri" and the "Ichidai Sanzen Daisen Sekai."

Additionally, Shusui is said to possess a unique ability known as "meito," which means it is a sword of exceptional quality that is among the strongest in the world. This ability is said to enhance the sword's cutting power and make it even more effective in battle.

Overall, Shusui is a powerful and legendary sword that serves as a testament to Zoro's skill as a swordsman. Its unique design and exceptional cutting power make it a formidable weapon in battle, and its history as a legendary samurai sword adds to its mystique.