What Are One Piece Ancient Weapons? The Secrets Behind Pluton, Poseidon and Uranus

In the world of One Piece, there are many powers capable of changing the balance of the entire world. However, the most mysterious and dangerous forces are undoubtedly the legendary One Piece Ancient Weapons.

Since the Alabasta Arc, Eiichiro Oda has continuously planted clues about these ancient powers. Among them, Pluton, the first Ancient Weapon introduced in the story, is deeply connected to the Poneglyphs, the Ancient Kingdom, and the hidden secrets of the World Government. It has also become one of the most important clues leading toward the Final War.

The three legendary Ancient Weapons are:

• Pluton
• Poseidon
• Uranus

These are not ordinary weapons. They are powerful forces left behind by a lost civilization from 800 years ago.

Among them, one piece pluton is the Ancient Weapon that has attracted the most attention from fans. So, what exactly is Pluton? Why is the World Government so afraid of it? And what connection does it have with the legendary treasure One Piece?

One Piece Ancient Weapons: The Three Powers That Can Change History

In the One Piece manga, the Ancient Weapons were first officially introduced during the Alabasta Arc.

At that time, the leader of Baroque Works, Crocodile, traveled to Alabasta in search of the legendary Ancient Weapon Pluton.

He believed that obtaining Pluton would give him power strong enough to challenge the World Government and allow him to create his own ideal nation.

However, Crocodile did not know that the true secrets of Pluton were hidden within the Poneglyphs.

Later, Nico Robin discovered information about Pluton by reading the historical text, officially connecting the story to the mystery of the Ancient Weapons.

Pluton: The Mysterious Ancient Battleship Introduced in Alabasta

In the manga, Pluton was first described as:

An ancient battleship with overwhelming destructive power.

It was created by the Ancient Kingdom 800 years ago and possessed enough power to destroy entire countries.

At the end of the Alabasta Arc, Robin discovered information about Pluton in front of the underground royal tomb’s Poneglyph.

Although Crocodile wanted Robin to reveal the location of the legendary weapon, Robin chose to hide the truth.

This was the first major moment in One Piece that revealed:

The Ancient Weapons were not just myths — they were real powers existing in the world.

Water 7 Arc: Pluton’s Blueprint and Franky’s Secret

The Water 7 Arc revealed even more important information about one piece pluton.

The story revealed that Pluton was not only an ancient battleship. There was also a blueprint that could be used to recreate it.

This blueprint was protected by generations of shipwrights in Water 7.

During this arc:

• Iceburg possessed the blueprint
• Franky inherited the secret
• CP9 searched for the Pluton blueprint on behalf of the World Government

The World Government sent CP9 to infiltrate Water 7 because they wanted the technology capable of creating the Ancient Weapon.

Eventually, Franky decided to burn the blueprint because he believed such destructive power would bring disaster if it fell into the wrong hands.

This storyline proved that:

Pluton is not only a ship, but also an advanced technology capable of changing the world.

Why Did Franky Destroy the Pluton Blueprint?

Many fans originally believed that destroying the blueprint meant Pluton could never exist again.

However, later manga events suggest something different:

The real Pluton may already exist.

The purpose of the blueprint may not have only been to create another Pluton, but also to prevent dangerous forces from recreating the weapon.

As someone who witnessed the secret of the Ancient Weapon, Franky became an important character connecting the past and the future.

Wano Country Arc Reveals: Pluton Truly Exists Underground

In the Wano Country Arc, the mystery of Pluton received a major revelation.

Through Kozuki Oden’s journal and Robin’s investigation into history, the Straw Hat crew discovered:

Pluton is located beneath Wano Country.

Wano was not always the isolated country seen today. It had a deep connection with the ancient history of the world.

The manga revealed that ancient Wano had a unique structure:

• Massive surrounding walls
• A sealed ocean environment
• Hidden secrets beneath the country

These features may have been created to protect Pluton.

During Kaido’s rule over Wano, the World Government also kept a close watch on the country because they knew:

Once Wano opened its borders, the Ancient Weapon Pluton could return to the world stage.

The Connection Between Pluton and Joy Boy

As the story moves into the Final Saga, the connection between the Ancient Weapons and Joy Boy becomes increasingly clear.

800 years ago:

• The Ancient Kingdom existed
• Joy Boy lived during that era
• The World Government was established
• The Void Century occurred

All of these events are connected by one central theme:

The power to change the destiny of the world.

Pluton was likely one of the important powers left behind from Joy Boy’s era.

During the Fish-Man Island Arc, Robin discovered information about Joy Boy through a Poneglyph and learned that he had made a promise to Fish-Man Island.

This suggests:

The Ancient Weapons were not created only for destruction. They may also be keys to achieving a greater goal.

Poseidon: The True Identity Hidden Within Princess Shirahoshi

Compared with one piece pluton, the identity of Poseidon has already been revealed in the manga.

During the Fish-Man Island Arc, the Straw Hat Pirates discovered that Princess Shirahoshi was the current Poseidon.

She possesses a unique ability:

She can communicate with and control the enormous Sea Kings.

To the Sea Kings, Shirahoshi is the “Queen of the Sea” who has been awaited for hundreds of years.

Her connection with Joy Boy’s promise proves that the Ancient Weapons are not simply tools of war.

Uranus: The Biggest Mystery of the Final Saga

Among the three Ancient Weapons, Uranus remains the greatest mystery.

The manga has not yet fully revealed its true identity.

However, many fans believe Uranus may be connected to:

• The sky
• The Moon civilization
• Ancient technology
• A secret weapon of the World Government

If Pluton represents the power of the land, and Poseidon represents the power of the sea, then Uranus may represent the power of the sky.

Together, these three Ancient Weapons may hold the key to changing the entire world.

Why Is the World Government Afraid of One Piece Ancient Weapons?

According to the manga storyline, the World Government is not only afraid of the Ancient Weapons themselves.

What they truly fear is:

The hidden history revealed by the Ancient Weapons.

If people discover:

• Why the Ancient Kingdom disappeared
• How the World Government was created
• What Joy Boy left behind
• What happened during the Void Century

The current world order could collapse.

This is why the World Government has forbidden research into the Poneglyphs and hunted historians.

The reason Nico Robin became one of their biggest targets is because she possesses the ability to read these hidden historical records.

The Possible Connection Between Pluton and the Final War

As One Piece enters its Final Saga, more and more clues suggest that the upcoming major conflict will revolve around the Ancient Weapons.

The future war may involve:

• The Straw Hat Pirates
• The World Government
• The Revolutionary Army
• The Ancient Weapons
• The legacy of Joy Boy

And Pluton may become one of the most important factors determining the final outcome.

If Luffy inherits Joy Boy’s will, could Pluton become the key power that changes the world?

This remains one of the biggest questions among One Piece fans.

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Conclusion: Pluton Is More Than a Weapon — It Is the Key to a Hidden 800-Year History

From its first appearance in the Alabasta Arc, to the Pluton blueprint in Water 7, and finally the revelation in Wano Country, Pluton has remained one of the most important mysteries in One Piece.

As one of the One Piece Ancient Weapons, Pluton represents not only overwhelming destructive power but also the hidden truth of the world 800 years ago.

As the Final Saga continues:

The true power of one piece pluton, the secrets of the Ancient Kingdom, and the final destiny of the world may soon be revealed.

For One Piece fans, Pluton may not be the end of the story — it may be the ultimate key leading toward the truth behind the legendary treasure and the future of the entire world.