onepiece
Three weapons survive from the lost century — each named for a god, each said to be capable of destroying the world outright. Whoever holds even one holds a bargaining chip against every nation on the sea. The Government has spent eight centuries making sure none of them are ever found.
Pluton — the warship
A battleship of such destructive power that a single shot could erase an island. Its construction plans were hidden away by Tom, the shipwright who built the crew’s own ships — and the vessel itself is said to sleep sealed somewhere in the world, waiting for the blueprints or the hull to surface. Wars have been started over rumors of its location.
Poseidon — the sea’s own voice
The strangest of the three: not a machine, but a person. Every few centuries, a merfolk princess is born on Fish-Man Island with the power to command the Sea Kings — creatures large enough to sink fleets. That power currently lives in this generation, which makes its bearer the most protected — and most hunted — person alive.
Uranus — the mystery
The third weapon’s nature remains one of the story’s most guarded secrets — its existence is official history, its form is not. What is known is that the Government’s interest in it has never wavered, and that it may be closer to the throne of the world than anyone ever suspected.
Together with the Void Century they come from, the Ancient Weapons are the story’s long game: three reasons the world’s rulers fear the end of the voyage, and three reasons the final saga matters.