Fans have wondered about all of these things and more, including what role these mysterious weapons have in the plot as a whole. We can only speculate and guess at this point; however, only time will tell which of these theories will be validated and which will be disproved. The theories go from far-fetched and intriguing to very plausible and grounded. Even with the limited information we have thus far, there is a great deal to consider.
1. Pluton Is A Massive Drill That Remains Hidden Underground
The gigantic cruiser Pluton, capable of levelling entire islands, has been theorised to be a dormant drill beneath the surface. The Greek god Pluto, whose name means “Ruler of the Underground,” and the Pluton, a type of crystallised magma, are the inspirations for this hypothesis. However, the weapon could also be used to build new islands by digging into the ground and releasing lava into the ocean, which would then harden and become rock. While no explanation is foolproof, this one appears to be in line with the common fan assumption that this weapon has some sort of connection to Earth.
2. Poseidon Was Meant To Save The People of Fishman Island
The aim of the Ancient Weapon, which has been passed down through the generations and is now in the hands of Princess Shirahoshi, may be to avert an impending catastrophe for the people of Fishman Island. The theory that Joy Boy anticipated the future and destined Poseidon for a certain moment appears plausible, given that the gigantic ark Noah is constructed to be hauled by the giant, intelligent fish named the Sea Kings.
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3. Uranus Is A Rocketship Made To Explore The Galaxy
Many fans believe that the ultimate weapon, Uranus, is actually an interstellar spaceship. This idea has its roots in the existence of a planet of the same name, and it postulates that by the end of his expedition, Roger was smiling because he knew that even if he had become King of the Pirates, he could never conquer the stars. Perhaps this is also the reason Roger decided to pass Laugh Tale on to the next generation. It’s unlikely that the show will follow this turn, but it’s an intriguing interpretation of a concept that has come up only a few times.
4. Franky Modeled The Thousand Sunny After Pluton
One of very few persons in the world, if not the only person, Franky has seen the plans for the battleship Pluton. Also, Franky constructed the Thousand Sunny, the Straw Hats’ brand-new ship. Given this link, it’s not unreasonable to speculate that Franky based at least some of the new ship on the plans he had seen. Frank may have loosely based the ship’s armaments, auxiliary vessels, and power system on the Pluton, the only mass-producible weapon, after observing similar systems in other ships.
5. Poseidon Is A Descendant Of The Great Kingdom
Poseidon, the sword, is a human, therefore this idea makes sense. One would expect such a power to have originated from somewhere if it were to be passed down from generation to generation. And the World Government endeavoured to obliterate the Great Kingdom from history, which is where it all probably began, according to the current theory. Since the most likely cause of the void century is a cover-up born of fear, this theory makes logical. If there was any force capable of toppling them, it would be the authority to command the Sea Kings.
6. Uranus Has Already Been Seen On Skypiea
Poseidon, the sword, is a human, therefore this idea makes sense. One would expect such a power to have originated from somewhere if it were to be passed down from generation to generation. And the World Government endeavoured to obliterate the Great Kingdom from history, which is where it all probably began, according to the current theory. Since the most likely cause of the void century is a cover-up born of fear, this theory makes logical. If there was any force capable of toppling them, it would be the authority to command the Sea Kings.

7. The Buster Call Is An Incomplete Version Of Pluton
In Robin’s past, the knowledge of the old manuscript led to the destruction of her whole home island of Ohara. As this fan theory explains, it would be tragic and ironic if the very thing Nico Robin and the Straw Hats were after was the very thing that wiped off her people.
According to this theory, there is a link between Pluton’s rumoured ability to wipe out entire islands and the Buster Call, which had this very effect. It would explain a lot if the World Government had spent all this time in secret trying to recreate the Ancient Weapons so that their enemies couldn’t use them.
8. Poseidon Was What The Rocks Pirates Were Fighting Over
With the debut of the Rocks Pirates, an infamous gang consisting of various major characters from One Piece, including many future Emperors of the Sea, a theory emerged that this was the case. If this idea is correct, then before the Rocks Pirates were defeated in God Valley, they were squabbling over who would become Princess Shirashoshi as she was still in her egg. Fans speculate that Garp’s promotion to “Hero of the Marines” is due in part to the fact that he was able to prevent the Rocks Pirates from obtaining an Ancient Weapon during this battle rather than to his simple victory over them.
9. Uranus Is The One Piece
Fans may not have seen much of this Ancient Weapon because it has been hidden on the last island. But what use does it serve, and why is it tucked away in a corner of Laugh Tale? According to one hypothesis, this weapon can be used to “lift the earth to the skies” by manipulating the environment. This idea is consistent with the observation that the weapon resembles Greek mythology of the same name, but it departs from that line of thinking by proposing that the weapon has the power to both sustain and kill life through its manipulation of air and oxygen.
10. The Ancient Weapons Were Created To Bring World Peace
Many viewers believe that the secret meaning of “One Piece” will be “One Peace” and that the series will end up providing “One Peace”-style instructions for achieving global harmony. According to this line of thinking, the first stage is to eliminate the Red Line, and doing so will necessitate the use of the Ancient Weapons. Both Sanji and Brook’s hopes of finally getting to meet Laboon again would be realised by this incident. Therefore, this explanation appears to be the most coherent and reasonable conclusion proposed thus far, from a narrative perspective. The time has come for fans to find out if this notion is accurate.
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