One Piece Ancient Weapons Timeline: From the Void Century to the Final Saga

Among the most enduring enigmas in the world of One Piece are the ancient weapons. Known as Pluton, Poseidon, and Uranus, these legendary creations are said to possess the power to reshape the world. Despite being teased as early as the Alabasta arc, the true nature and role of the One Piece ancient weapons have remained elusive, feeding decades of fan theories and speculation.

These aren’t just relics of a forgotten age. They’re instruments of godlike destruction, directly tied to the Void Century, the lost history of the world, and the rise of the World Government. As the final saga begins, these weapons are no longer just theoretical. They are now central pieces on the global chessboard, with major factions hunting them down for power, revolution, or preservation.

This is the timeline of the One Piece ancient weapons—from their mysterious beginnings to their current roles in the story.

Origins in the Void Century

Over 800 years ago, during the time now known as the Void Century, the One Piece ancient weapons were created. While little is officially known about this era, we do know it culminated in the rise of the World Government and the erasure of an advanced civilization that posed a threat to their rule.

It’s strongly implied that this civilization possessed or created the ancient weapons. The fact that the World Government went so far as to erase all records of this time, including the use of the forbidden Poneglyphs, speaks to the sheer danger and political weight these weapons carry. The weapons are believed to be both technological and mystical in nature, each with unique abilities that can upend the balance of the world.

The names of the three weapons—Pluton, Poseidon, and Uranus—are derived from mythological deities, suggesting their overwhelming power and symbolic ties to sea, sky, and land. All three are tied to the mysterious Ancient Kingdom, a civilization that many now believe is linked to Joy Boy, the original wielder of freedom and a key figure in the world’s forgotten history.

The Revelation of Pluton in Alabasta

The first mention of a One Piece ancient weapon appears during the Alabasta arc. As Crocodile searches for the weapon Pluton, it becomes clear that the weapon isn’t a mere legend—it’s real and terrifying. Robin reveals that the Poneglyph hidden beneath the Alabasta palace contains its blueprints or location.

Pluton is described as a massive warship capable of destroying entire islands with a single blast. Franky later burns the blueprints for Pluton in Enies Lobby to prevent it from falling into the wrong hands. But as we now know from the Wano arc, Pluton still exists—buried beneath Wano Country itself. This reveal solidifies Pluton’s place in the timeline, making it the first weapon to have both ancient and modern links.

With Wano’s borders now open, the threat of Pluton’s awakening becomes more real than ever. Whether it will be used in the final war remains a lingering question, but one thing is clear—it’s not just a theory anymore.

Poseidon Awakens in Fish-Man Island

The second weapon, Poseidon, is entirely different from Pluton. Rather than being a technological device, Poseidon is a living being—Shirahoshi, the mermaid princess of Fish-Man Island. As revealed by Neptune and later confirmed by Nico Robin, Shirahoshi has the ability to command the Sea Kings, enormous sea creatures capable of causing tsunamis and leveling fleets.

This revelation adds a fascinating twist to the idea of weapons as people. Shirahoshi herself is kind and compassionate, and the tragedy of her power lies in the potential for misuse. Her role as Poseidon makes her one of the most important characters in the world, and it's no surprise that ancient Poneglyphs point to her existence.

More importantly, Poseidon is tied to the promise made by Joy Boy to the mermaid princess centuries ago. The connection between Poseidon and the Noah ship, meant to be pulled by Sea Kings, further deepens her role in the eventual restoration of balance to the world.

As of the Final Saga, Shirahoshi is safe in the Holy Land Mariejois, but this also places her in the heart of danger. The World Government is aware of her powers and may attempt to control or eliminate her if they see her as a threat to their rule.

Uranus: The Final Mystery

Uranus remains the most mysterious of the One Piece ancient weapons. Unlike Pluton and Poseidon, Uranus has yet to be definitively revealed in the story. Some theories suggest it is a weather-controlling device, while others believe it may be connected to the sky people from Skypiea or even Imu, the shadowy ruler of the World Government.

Recent events in One Piece suggest that Imu may already possess or use Uranus. The destruction of the Lulusia Kingdom by an unknown sky-based attack shocked the world, and the implication is that some god-level weapon was responsible. If this is Uranus, it means the final ancient weapon is already in play and under the control of the very power Joy Boy once sought to overthrow.

This makes Uranus not just the final piece of the puzzle, but potentially the biggest obstacle standing in the way of Luffy and the Straw Hats in the final saga.

Ancient Weapons and the Final War

As One Piece enters its final saga, the ancient weapons have gone from myth to reality. They are no longer plot devices in the background—they are the stakes. Every major power in the world has an interest in them. The Revolutionary Army wants to break the World Government’s grip. The Blackbeard Pirates are hunting for weapons and Devil Fruits to consolidate power. And Luffy, unknowingly walking in Joy Boy’s footsteps, may end up being the one to unite or destroy them.

Pluton is under Wano. Poseidon is alive and maturing. Uranus may already be active. With the Straw Hats now in the endgame, it is inevitable that the One Piece ancient weapons will collide in the grandest conflict the series has ever known.

And what lies at the end of the Grand Line—Raftel, the One Piece, the true history—may depend entirely on how these weapons are used, or who is strong enough to stop them.

Conclusion

The One Piece ancient weapons are not just relics of the past—they are keys to the future. They were forged during the Void Century, buried and hidden by time, and now rise again as the world approaches its most critical moment. Each weapon represents a different kind of power. Pluton represents destruction, Poseidon represents control over the seas, and Uranus likely controls the skies.

Together, they form a triangle of ultimate power. And as Luffy and his crew uncover the world’s secrets, the choices they make regarding these weapons may determine whether the world is liberated or destroyed.

The timeline is set. The pieces are moving. And the ancient weapons are ready to shape the final chapter of One Piece history.