Kitetsu. Onis can be killed only by these weapons. Should be something like GAMEFOLDERJUMP_FORCEContentPaksmods by the end.
Kitetsu 妖刀 鬼鉄 Youtou Kitetsu lit. Zoro picked the sword from a barrel of cheap katanas in a shop at Loguetown after sensing its quality. Like all of its predecessor Kitetsu swords this one is said to be cursed.
When the owner first saw it he was not going to allow Zoro to buy it telling him of the curse.
The Owner of Shodai Kitetsu. Ogre Steel is the weapon of choice used by the infernal Dark Samurai Doku. Onis can be killed only by these weapons. Katana Roronoa Zoro Sandai KitetsuRp380000.