The three Ancient Weapons are weapons capable of destroying the world, which the government and certain pirates seek to seize for their own ends. Their names are Pluto, Poseidon, and Uranus. Since the Ancient Weapons are linked to the Void Century, the World Government is trying to prevent people from researching them, fearing that knowledge of these weapons could lead to a world war.

However, this hasn't stopped members of the World Government, such as Spandam and the former Crocodile Shichibukai, from attempting to obtain one of the weapons. Even without knowledge of the Void Age, their power has been known to interest casual observers (as was the case with Vander Decken IX, who took an interest in the Shirahoshi, otherwise known as the Ancient Poseidon Weapon).

In this article, we'll introduce you to the ancient weapons in One Piece and tell you what they are, as well as their powers and abilities. This article will serve as a guide and introduction to the ancient weapons in One Piece. We won't go into too much detail here, but there will be some spoilers, so if you don't want to know the details until you reach the desired point in the plot, be careful how you approach this article.

What are the ancient weapons in One Piece?

The Ancient Weapons in One Piece are the most dangerous weapons of mass destruction in the world, created during the Void Century. There are only three of them: Pluto, Poseidon, and Uranus. These weapons are not limited to inanimate objects like normal weapons, but can also be latent in any being, meaning they are simply a special ability.

Ancient weapons are the argument used by the World Government to ban research into the Void Century, as they fear that knowledge of these weapons could lead to a world war. However, this has not stopped some members of the World Government, notably Spandam and the former Sea Warrior Crocodile, from attempting to claim one for themselves. Some, even unaware of the Void Century's existence, have been drawn to its power, as was the case with Vander Decken IX and his interest in Shirahoshi, also known as Poseidon.

Not much is known about them collectively, and since we'll be analyzing each of these weapons individually in separate articles, we won't be giving you too many details here in this article. They're powerful and mysterious, which is why they're so important to the entire story of One Piece. In fact, the Ancient Weapons are basically the most powerful weapons in the entire story of One Piece, which speaks volumes about their relevance to the plot.

Their overall role in the story remains to be seen, however, as Oda hasn't revealed much about them, nor have they been used yet. But the danger they pose to the world speaks volumes about their importance.

What are the powers of the ancient weapons in One Piece?

In this section, we'll give you some details about the ancient weapons and their known powers and abilities. We won't give you too many details, as you can discover each of them individually in separate articles. As we mentioned, there will be some spoilers in the paragraphs below, but don't expect too many revelations at this point; the individual articles will serve that purpose.

Pluto

Although Pluto has not yet physically appeared in history, it has been described as an ancient ship capable of causing massive damage. It was built on Water 7 during the Void Century, and the shipwrights of that island kept the plans safe as a safety precaution, in case Pluto fell into the wrong hands. Fortunately, the ship was lost to history before that time.

The plans were passed down through generations, and ten years before the main story, they fell into the hands of the fish-man carpenter, Tom, from Tom's workmen. At this point, Spandam sought them out to acquire the plans so they could use Pluto to end the Great Age of Pirates.

Tom refused the request and soon after handed them over to his apprentice Iceburg, who passed them on to his other apprentice, Cutty Flam, aka Franky, five years later to better hide them. When Franky was captured by the World Government, he kept the plans hidden within his own body until he realized that Nico Robin, the only living person capable of reading the Poneglyphs and reviving the Ancient Weapons, had no intention of doing so or using that power to destroy the world, but later burned the plans.

While the details are unknown, it is known that Pluto is located somewhere in Wano Country, and that this is what the Alabasta Poneglyph indicated. It is supposed to be a large warship. Not much else is known about it. When they first saw the plans, Franky, Iceburg, and then Kaku and Rob Lucci seemed shocked, with Franky and Iceburg wondering how a ship like Pluto could be built in the first place.

Its power was as dangerous as that of other weapons like Uranus and Poseidon, though the exact details of their capabilities remain unknown. Pluto is said to be capable of destroying entire islands. Whoever had the weapon under their control had the potential to conquer the world, and in the wrong hands, it would be extremely dangerous. Likewise, Pluto also had the ability to wreak such havoc on the world.

Furthermore, since the plans persisted even after the ship's construction, anyone possessing the ship's plans would have the ability to build a fleet of ships with the same destructive capabilities as Pluto. The plans had been kept as a failsafe measure to revive Pluto should the world need it to combat weapons, including the original battleship itself. At this point, however, the plans that were used to create it are now destroyed while Pluto itself remains dormant.

Poseidon

Poseidon was first mentioned when Nico Robin read the Skypiea Poneglyph. Recently, the king of the Ryugu Kingdom, Neptune, revealed that Poseidon is located on Fish-Man Island. This weapon is not an object, but a hereditary ability that only a few female members of the Fish-Man Island royal family develop every 100 years, according to Neptune himself.

A power inherited and awakened by Princess Shirahoshi, which consists of being able to summon, communicate with, and control the kings of the sea at will. The only mermaid princess who also possesses this ability is Princess Poseidon, who lived in the Void Age. Instead of being an inanimate object like usual weapons (except for weapons attached to Devil Fruits), Poseidon is a mermaid who belongs to the royal lineage of the Ryugu Kingdom.

After her death, her name was treated as a title given to a mermaid born into the royal family and possessing the same power she possessed in life. Nowadays, Shirahoshi has inherited the power and name of Poseidon from her. Anyone possessing this ability is called a Mermaid Princess. Poseidon has the power to communicate with and control the kings of the sea, an ability that even the most powerful merfolk cannot wield.

This is considered a powerful weapon due to the potential of the Sea Kings, whose power is such that they can easily destroy and sink islands, and controlling this force is considered one of the most formidable abilities in the world. While this power, guided by the power of love, can save thousands of lives, with evil intentions, it can sink everything in the ocean and could even have the ability to "destroy the world."

The Sea Kings call Poseidon their "queen." The current Mermaid Princess, Shirahoshi, has shown that her powers awakened at the age of six, having no control over her own abilities and subconsciously summoning Sea Kings when she screamed aloud, which was feared throughout Fishman Island. Ten years later, during the battle against the New Fishman Pirates, Shirahoshi fully awakened her abilities and seemingly took control of them.

One Piece Figure

Come see

Uranus

Uranus was mentioned by King Neptune while explaining to Nico Robin the meaning of the apology letter he had written on the poneglyph on Fish-Man Island. Nothing is currently known about Uranus except his name. Given the nature of Pluto and Poseidon, Uranus could easily be an animate or inanimate object.

Uranus is the only ancient weapon we know nothing about at the time. It exists, everything is known, but we still don't know what it is or who it can do, or what it can do. This is one of the biggest unanswered mysteries in One Piece, so we expect Ida to reveal the truth about Uranus relatively soon, as it could play a pivotal role in future events.