Rokuogan, One Piece Wiki

Rokuogan is the secret seventh technique that far surpasses the other six primary techniques of "Rokushiki". So far, it has only been utilized by Rob Lucci. Rokuogan is the ultimate attack of the Rokushiki style. Rob Lucci states that only those who have absolute mastery of the other six skills can have access to this seventh technique. The user places both their fists right in front of the target to focus their physical strength to launch a devastating shock wave from their knuckles in a forwar

ENIES LOBBY ARC – Anime web

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Rokuogan, One Piece Wiki

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Rokushiki, One Piece Wiki