What are the three Ancient Weapons - Pluton, Poseidon, and Uranus?Fiction
In-universe lore. Claims are judged against the fiction's own canon, not the real world.
One Piece names three world-ending Ancient Weapons from the Void Century, Pluton, Poseidon, and Uranus, each named for a god and each able to reshape the world. This ledger separates what Eiichiro Oda's ongoing manga has actually confirmed about them from what fans still argue over and what the story has deliberately left blank.
7 established, 2 disputed, 1 debunked, 4 unresolved. We do not pick an answer; the evidence places each claim. How we decide
30 citations from 4 independent sources - 26 echo the same voices and count once. Graded B1-D1.
Added 4 Jul 2026 - canon current as of 4 Jul 2026
What the four states mean
- Establishedsupported, uncontested
- Disputedcredible sources disagree
- Debunkedrefuted by the evidence
- Unresolvedno settled answer
Established 7supported, uncontested
The manga establishes three Ancient Weapons, each capable of mass destruction and each named after a god, Pluton, Poseidon, and Uranus; their existence and names were laid out when Nico Robin and King Neptune discussed them on Fish-Man Island in Chapter 650.▰▰▱▱▱ likely2 points
Supports- The Ancient Weapons are three weapons capable of mass destruction, each taking a different form. They are known as Pluton, Poseidon, and Uranus, each named after a deity for their godly powers. The weapons are not limited only to inanimate objects, but consist of living beings as well.Ancient Weapons - One Piece Wiki primary
- Uranus is one of the three Ancient Weapons that existed during the Void Century along with Poseidon and Pluton. It was first mentioned during Nico Robin's conversation with King Neptune, when she says there are three ancient weapons that bear the names of "gods".Uranus - One Piece Wiki primary
Pluton is confirmed to be an ancient battleship, dubbed the World's Worst Battleship, said to be able to destroy a whole island in a single shot; it was revealed to be a warship in Chapter 352 and was built on the island of Water 7 during the Void Century.▰▰▱▱▱ likely2 points
Supports- Pluton is a highly advanced warship capable of mass destruction, labeled the World's Worst Battleship. It was constructed long ago in the city of Water 7 in the Grand Line. The battleship is said to be capable of destroying whole islands in a single shot and is located deep beneath Mt. Fuji in Wano Country.Pluton - One Piece Wiki primary
- While Pluton has yet to appear in the story, it has been confirmed to be an ancient battleship capable of massive damage and destruction. It was built on the island of Water 7 sometime during the Void Century, though the precise reason for its construction remains unknown.Ancient Weapons - One Piece Wiki analysis
The shipwrights who built Pluton kept its blueprints as a safeguard, so a second Pluton could be built to fight the first, and passed them down master to apprentice; in the modern era they went from the fish-man carpenter Tom to Iceburg to Cutty Flam, better known as Franky, who burned them in Chapter 399 to keep them from the World Government's Spandam.▰▰▱▱▱ likely2 points
Supports- The shipwrights that built Pluton kept the blueprints to the ship as a safety measure; in case Pluton were to ever fall into the wrong hands, another one could be built to fight the existing one. The blueprints were passed down from master to apprentice shipwrights for generations, and ten years prior to the main storyline were held by the fish-man carpenter, Tom, of Tom's Workers.Ancient Weapons - One Piece Wiki primary
- When Franky was captured by the World Government, he kept the blueprints hidden within his own cyborg body until he understood that Nico Robin, the only living person who could read the Poneglyphs and subsequently revive the Ancient Weapons, had no intention of doing so; thus, he subsequently burned the blueprints to prevent them from falling into Spandam's hands.Ancient Weapons - One Piece Wiki primary
Poseidon is not an object but a living being: the Ancient Weapon is a mermaid of the Ryugu royal line able to communicate with and command the Sea Kings, and the current holder is Princess Shirahoshi, a fact revealed on Fish-Man Island in a conversation between Robin and King Neptune around Chapters 649 to 650.▰▰▱▱▱ likely2 points
Supports- Poseidon is not an object but a living being: a mermaid endowed with the extraordinary ability to communicate with and command the Sea Kings. The power is currently manifested in Shirahoshi, the 16-year-old mermaid princess of the Ryugu Kingdom.Poseidon - One Piece Wiki primary
- Despite their status as a "weapon", Poseidon was not an object, but in fact a special mermaid that had the power to talk to Sea Kings, enormous sea creatures capable of mass destruction. Eight hundred years later, Princess Shirahoshi also developed this power, and as stated in a conversation between Neptune and Robin, she has now inherited the title "Poseidon".Ancient Weapons - One Piece Wiki primary
Poseidon's danger lies in the Sea Kings, monsters able to sink islands, which the Mermaid Princess can call as their queen; Shirahoshi's cries summoned Sea Kings uncontrollably as a child, and her fully awakened power later saved Fish-Man Island by commanding them to stop the giant ship Noah from crushing it.▰▰▱▱▱ likely2 points
Supports- Poseidon possesses the power to commune with and command the Sea Kings, an ability beyond the reach of even the mightiest merfolk. This gift is regarded as one of the most formidable weapons in existence because of the Sea Kings' destructive potential to sink islands with ease. To the Sea Kings themselves, the Mermaid Princess is revered as their queen.Poseidon - One Piece Wiki analysis
- Shirahoshi's power was finally fully awakened during the battle against the New Fish-Man Pirates, an event King Neptune himself noted with concern. Yet her mastery of the Sea Kings ultimately saved Fish-Man Island by preventing Noah from crushing it.Poseidon - One Piece Wiki analysis
The World Government uses the danger of the Ancient Weapons as its stated reason for forbidding research into the Void Century, fearing that knowledge of the weapons could trigger a global war; because only a Poneglyph reader such as Nico Robin can locate or revive them, this ties the weapons directly to the Government's hunt for readers, examined in the sibling topics onepiece-void-century-and-ancient-kingdom and onepiece-imu-and-world-government-secret.▰▰▱▱▱ likely2 points
Supports- The Ancient Weapons are the argument used by the World Government to forbid research of the Void Century, since they fear that knowledge of the weapons could result in a global war.Ancient Weapons - One Piece Wiki analysis
- Nico Robin, the only living person who could read the Poneglyphs and subsequently revive the Ancient Weapons, had no intention of doing so or even planned on using that power to destroy the world.Ancient Weapons - One Piece Wiki analysis
The manga has confirmed that an Ancient Weapon powered by Vegapunk's stolen Mother Flame was used to erase the Lulusia Kingdom from the map, and that each use of such a weapon raises the world's sea levels; Vegapunk stated this in his worldwide broadcast around Chapters 1115 to 1116.▰▰▱▱▱ likely2 points
Supports- Vegapunk, who observed the after-effects of the kingdom's destruction, reiterated that the attack was likely to be the work of an Ancient Weapon, powered by the recently stolen Mother Flame.Ancient Weapons - One Piece Wiki primary
- Vegapunk and Ivankov believe that an Ancient Weapon powered by the Mother Flame was used to destroy the Lulusia Kingdom.Uranus - One Piece Wiki primary
Disputed 2credible sources disagree
Whether the weapon that destroyed Lulusia was specifically Uranus is disputed: some coverage reads the Egghead reveals as confirming it was Uranus, while the One Piece Wiki, reading the same chapters, holds that this remains unknown because Uranus's function and location have never been shown.▰▰▰▱▱ roughly even chance1 against2 points
Supports- Chapter #1115 of One Piece finally confirms that the weapon used to destroy Lulusia was in fact the Ancient Weapon Uranus. The Mother Flame created by Vegapunk is only the power source or the fuel for Uranus, not the name of the mysterious weapon used by Imu.One Piece Finally Confirms the Existence of the Final Ancient Weapon and Who Has It - ScreenRant summary
Against- It is unknown if this was Uranus since its function and location have not been revealed; however, it is the only Ancient Weapon that is currently unaccounted for.Uranus - One Piece Wiki analysis
Whether the Ancient Weapons are purely instruments of annihilation or dual-use tools that can also protect and rule is genuinely open in the text: the manga frames Poseidon's power as able to safeguard countless lives or plunge the world into ruin depending on who wields it, and describes Uranus as a weapon that can be used to rule the world or, in the wrong hands, destroy it.▰▰▰▱▱ roughly even chance1 against3 points
Supports- To command such beings is to hold dominion over a force that can either safeguard countless lives when guided by love, or plunge the world into ruin when driven by malice.Poseidon - One Piece Wiki analysis
- Like Pluton and Poseidon, Uranus is a dangerous weapon which can be used to rule the world or, in the wrong hands, destroy it.Uranus - One Piece Wiki analysis
Against- The Ancient Weapons are three weapons capable of mass destruction, each taking a different form.Ancient Weapons - One Piece Wiki analysis
Debunked 1refuted by the evidence
The long-standing belief, held since the Arabasta arc, that the battleship Pluton itself lay buried in Arabasta was contradicted by the manga: Chapters 1053 to 1055 revealed that the Arabasta Poneglyph only records Pluton's location, which is Wano Country, and the former shogun Kouzuki Sukiyaki confirmed the ship rests beneath Wano, not in Arabasta.Refuted by
Nico Robin stated that the poneglyph in Arabasta said that it was actually somewhere in Wano. Kouzuki Sukiyaki, a former shogun of Wano, confirmed this to her upon her statement.
refuted2 against3 pointsThe claim rested on- Pluto ruled the underworld, which was believed to be underground and all mineral wealth within the earth belonged to him; Pluton is said to be buried deep somewhere in Arabasta.Ancient Weapons (Trivia) - One Piece Wiki analysis
Refuted by- Nico Robin stated that the poneglyph in Arabasta said that it was actually somewhere in Wano. Kouzuki Sukiyaki, a former shogun of Wano, confirmed this to her upon her statement.Ancient Weapons (Trivia) - One Piece Wiki primary
- Sukiyaki informs the pirates that the borders of old Wano themselves are what keep Pluton locked away, and were they to fall, then the Ancient Weapon would be unleashed.A Giant One Piece Mystery is About to Be Solved At Last - ScreenRant summary
Unresolved 4no settled answer
Whether the original battleship Pluton still exists intact, and can still be raised, is unresolved: Franky burned only the blueprints and never the ship, and the manga places the actual Pluton in a hidden cavern beneath the submerged Mt. Fuji in Wano, said to be releasable only if Wano's mountainous borders fall, the true meaning fans and characters give to the phrase about opening Wano's borders.▰▰▰▱▱ likely2 points
Supports- It currently rests within a secret cavern at the foot of the submerged Mt. Fuji in old Wano Country, below the cavern where Wano's Road Poneglyph is currently hidden. In order for Pluton to be released, the mountainous walls surrounding Wano would have to be brought down; this is the true meaning of "opening Wano's borders".Ancient Weapons - One Piece Wiki primary
- The reveal of Pluton's secret location is crazy enough, but it points towards an even bigger secret. Sukiyaki informs the pirates that the borders of old Wano themselves are what keep Pluton locked away, and were they to fall, then the Ancient Weapon would be unleashed.A Giant One Piece Mystery is About to Be Solved At Last - ScreenRant summary
What role the three weapons will play in the coming war is unresolved, but the manga has set the board: both Charlotte Linlin and Kaidou hunted the weapons while each unknowingly ruled a territory that housed one, Big Mom's Fish-Man Island holding Poseidon and Kaidou's Wano holding Pluton, and the World Government now appears to hold and have used the third, with the story leaving the weapons' final deployment open, a thread continued in onepiece-imu-and-world-government-secret.▰▰▰▱▱ likely2 points
Supports- Both Charlotte Linlin and Kaidou desired to find the Ancient Weapons and conquer the world. Ironically, each had control over a territory that housed one of the weapons without even knowing it. Linlin had Fish-Man Island, which housed Shirahoshi/Poseidon, under her protection. Kaidou reigned over the Wano Country, which housed Pluton.Ancient Weapons - One Piece Wiki analysis
- A small sample of it was stolen by York and sent to the Five Elders and Imu, who used it to power up an unknown Ancient Weapon. Using the Mother Flame as fuel, the Ancient Weapon can destroy entire Kingdoms in seconds.One Piece Finally Confirms the Existence of the Final Ancient Weapon and Who Has It - ScreenRant summary
Uranus's true form and location are unresolved, the deepest of the three mysteries: beyond its name almost nothing has been shown, the manga has never confirmed whether it is a living creature or an inanimate machine, and it is the only Ancient Weapon still entirely unaccounted for in the story.▰▰▱▱▱ likely2 points
Supports- Uranus was a weapon known to have existed during the Void Century. Its actions during this point in history, its specifications, abilities, location, and what became of it since remains unknown.Uranus - One Piece Wiki analysis
- Nothing is currently known about Uranus, except its name. Given the nature of Pluton and Poseidon, Uranus could easily be an animate lifeform or an inanimate object.Ancient Weapons - One Piece Wiki analysis
Why Joy Boy preserved the weapons for future generations, and the purpose of the pact between the original Poseidon and Joy Boy, remain unresolved: the manga says Joy Boy had a role in keeping the weapons accessible for reasons still a complete mystery, and that the first Poseidon agreed to raise the ship Noah with the Sea Kings for a mission whose details would only be revealed on completion, a promise Joy Boy failed to keep and apologized for in a Poneglyph letter, threads tied to the siblings onepiece-void-century-and-ancient-kingdom and onepiece-imu-and-world-government-secret.▰▰▱▱▱ likely2 points
Supports- Poseidon lived during the Void Century and formed a pact with Joy Boy. Under this agreement, she was to use her powers to command the Sea Kings to raise Noah to the surface and carry out its intended purpose: a mission whose details would only be revealed once it was completed. For reasons unknown, Joy Boy failed to honor his commitment to Poseidon.Poseidon - One Piece Wiki analysis
- The ancient pirate Joy Boy had a role in their preservation so future generations could still access and use the weapons, but his reasons for doing so are still a complete mystery.Ancient Weapons - One Piece Wiki analysis
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