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I'm guessing the One Piece is the truth about the Void Century, probably the combined knowledge written on the Poneglyphs. Whitebeard mentioned that a world-engulfing war would break out once the One Piece was discovered, and the Void Century would make sense as the cause for something like that. And we know the Roger Pirates had translated the poneglyphs, so bringing it all together into one piece would make sense...
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