Shusui

Counted among the twenty-one Great Grade swords, Shusui is a black-bladed katana prized as the national treasure of Wano Country. Its reverse-wave temper line shows white in the manga and reddish-purple in the anime, set in a Kanemoto style, while the octofoil guard carries flower-like edges. The hilt wears black silk with no extra ornament, and the golden fittings on cap, guard, and end piece offset a black sheath decorated with dark red circles split into thirds. Following the Thriller Bark events Zoro tied a sageo cord around the upper sheath, and during the Dressrosa Arc the manga recolored the temper line red to match the anime.

As one of the twenty-one Great Grade swords, Shusui ranks among the world's finest, and it became a permanent Black Blade through Ryuma's countless battles. Its toughness is such that Zoro claimed a dinosaur's weight would not bend it a millimeter. The weapon's heft makes its strikes far more destructive than lighter blades like Yubashiri, a trait that can cause excess damage if poorly controlled.

Ryuma was famed for beheading an enormous dragon over Wano with little effort, and after two years training under Mihawk, Zoro recreated that feat by decapitating a dragon himself. At Dressrosa the blade, alongside Sandai Kitetsu and Wado Ichimonji, carved through Pica's stone golems and his fully Armament-hardened body.

Shusui first belonged to the legendary samurai Shimotsuki Ryuma and was entombed with him until Gecko Moria robbed the grave twenty-three years ago, an act that staggered Wano. Reanimated as a zombie on Thriller Bark with Brook's shadow, Ryuma fought with the blade once more before bequeathing it to Roronoa Zoro upon his defeat, satisfied with the new master. The katana replaced Zoro's destroyed Yubashiri. Kin'emon later sought to win it back for Wano, and after a string of thefts and trials, Gyukimaru returned the sword to Ryuma's grave. Zoro agreed to leave it behind once Kouzuki Hiyori offered him her own Great Grade blade, Enma, as a replacement.