Ancient Weapons

The 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.
Those weapons are known to have been employed during the Great War that occurred during the Void Century and are majorly responsible for the rise of global sea levels that has shaped much of the modern world geography. 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.
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 certain individuals, such as the former Warlord Crocodile, the government agent Spandam, and most notably the former members of the Four Emperors, Charlotte Linlin and Kaidou, from attempting to gain one or even all 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 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. It now 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".
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. At this point, Spandam of CP5 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 then entrusted them 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; thus, he subsequently burned the blueprints to prevent them from falling into Spandam's hands.
==Poseidon==
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. Despite having the ability to talk to sea creatures, no other merfolk are able to communicate with Sea Kings. Poseidon is usually born a princess of Ryugu Kingdom once every several centuries.
The previous known holder of Poseidon's 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:
** 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 actually somewhere in Wano. Kouzuki Sukiyaki, a former shogun of Wano, confirmed this to her upon her statement. So, Pluton's actual reference to the earth is unknown.
** was the ruler of the sea; Shirahoshi is the current Poseidon and the princess of Fish-Man Island, which resides underwater.
** was the personification of the sky; currently has no reference yet since its identity is unknown.
*Due to the tremendous power of the weapon that instantaneously destroyed an entire island without a trace and Sabo's description of an unnatural black shape above the clouds, Emporio Ivankov speculated it to have been an Ancient Weapon. Monkey D. Dragon, however, wondered why the Government would not use such a weapon until recently.
**Vegapunk, who observed an intense glow from above the kingdom, reiterated that the attack was likely to be the work of an Ancient Weapon, powered by the recently stolen Mother Flame.
*Some non-canonical weapons have been considered as powerful as the Ancient Weapons.
**The Marines' trump card, the Dyna Stone, is said to be a weapon with power on par with the Ancient Weapons.
**The Divine Breath can control all weather phenomena and was even feared by the Five Elders.
*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.
==References==
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