Pure Gold, One Piece Wiki

The Pure Gold is a metal created on the island of Alchemi hundreds of years ago, and is now assimilated into Bonbori's esca. The Pure Gold is a small egg-shaped golden orb that glows very brightly. However, it lost its form as it was dissolved in Bonbori's stomach, and manifested itself as a very bright light inside its esca. It is capable of halting the aging of anyone close to it, effectively making them immortal, and the stop in aging also means the stop of any sickness spreading in the body.

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