Ancient Weapons

The Ancient Weapons (古代兵器) 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.

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. However, this has not stopped members of the World Government, most notably Spandam and former Warlord Crocodile, from attempting to gain one of the weapons for themselves. Even without knowledge of the missing years, their power has been known to entice casual observers (as was the case with Vander Decken IX's interest in Shirahoshi, otherwise known as the Ancient Weapon Poseidon).

Pluton


While Pluton has yet to appear in the story, it has been referred to as an ancient battleship capable of massive damage and destruction. It was built on the island of Water 7 sometime during the Void Century, and the shipwrights kept the blueprints as a safety measure in case Pluton ever fell into the wrong hands, another one can be built to fight the existing one. Fortunately, the ship was lost to history before that could happen.

It is currently located in 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 walls surrounding Wano would have to be brought down. This is the true meaning of "opening Wano's borders".

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. At this point, Spandam sought him out in order to acquire the blueprints so that they could use Pluton to put an end to the Great Pirate Era (in reality, it was to overthrow the World Government). Tom denied the request, and shortly afterwards handed them down to his apprentice Iceburg, who passed them on to Tom's other apprentice Cutty Flam, otherwise known as Franky, five years later in order to better hide them. 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 or even planned on using that power to destroy the world; he subsequently burned the blueprints.

Poseidon


Poseidon was a Mermaid that had the power to talk to Sea Kings, enormous sea creatures capable of mass destruction. Despite having the ability to talk to sea creatures, no other merfolk are able to communicate with Sea Kings. A Mermaid Princess with this ability is born into the royal family of the Ryugu Kingdom once every several centuries.

The previous holder of the Poseidon power was a Mermaid Princess who lived during the Void Century. 800 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".

Poseidon was first mentioned when Nico Robin read the Poneglyph on Skypiea. However, details of the weapon were not delved into until much later, when she reached Fish-Man Island. Legend states that the Mermaid Princess with the power to communicate with the Sea Kings will meet someone who will help guide her power.

Uranus
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.

Trivia

 * Each of the Ancient Weapons is named after a Greco-Roman god affiliated with the earth, sea, and sky respectively, and they each have some reference to said weapon:
 * 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. However, Nico Robin stated that the poneglyph in Arabasta said that it was somewhere in Wano. Kozuki Sukiyaki, a former shogun of Wano, confirmed this to her upon her statement. So Pluton's actual reference to the earth is unknown.
 * Poseidon was the ruler of the sea; Shirahoshi is the current Poseidon and a mermaid princess.
 * Uranus was the personification of the sky; currently has no reference yet since its identity is unknown.
 * The Marines' trump card, the Dyna Stone, is said to be a weapon with power on par with the Ancient Weapons.

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