Rankyaku, One Piece Wiki

Rankyaku is one of the six techniques of "Rokushiki" that allows one to create air blades. Rankyaku is a powerful projectile technique, in which the users start by kicking at very high speeds and strength, which results in a sharp compressed blade of wind or "Sickle Wind" (鎌風, Kamakaze?) that can slice through objects and greatly damage a human body. Depending on the strength and scale of the technique, it is potentially capable of slashing a whole building in half. While this technique is norma

Rokushiki is based on physical strength is actually based on a mistranslation in earlier One Piece volumes : r/OnePiece

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