LogFAQs > #950692980

My current theories:

One Piece is the ancient weapon Uranus. It's the only weapon we know nothing of, so a part of me thinks it's because it's the One Piece.

Also, the One Piece has something to do with traveling to the moon. There used to be a civilization on the moon made of the ancestors of the Bilkans, Skypieans and Shandians; and each of these civilizations set off to earth, with the Shandians founding the ancient gold city of Shandora. The Shandorans defended their city in a massive war during the void century, and they fell, with only a small tribe surviving (modern shandians). The promise of Shandora was fullfiled when Gold Roger visited the bell of shandora in Skypiea (Robin confirms this to the shandian elder).

So the ancient moon civilization is connected to the void century, its descendants were enemies of the world government, and left a message/a promise that was fullfilled when the message got to Roger, which hints at a Joy Boy connection too. This is why I think One Piece has something to do with the moon.

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YoungMutual