Sandai Kitetsu, One Piece Wiki

For other uses of this name, see Kitetsu (Disambiguation). The Sandai Kitetsu is one of the Grade swords. Like all of its predecessor Kitetsu swords, this one is said to be a "Cursed Sword/Blade" (妖刀, Yōtō?). It is one of Kozuki Sukiyaki's creations. Zoro picked the sword from a barrel of cheap katanas in a shop at Loguetown after sensing its quality; Tashigi later identifies the sword from a catalog. When the owner first saw it, he was not going to allow Zoro to buy it, telling him of the curse

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