in a piece franchise, many powerful characters owe their power to proficiency with some type of weapon, which usually takes the form of a sword. Because of their skill with these weapons and mastery of Haki, these characters are often remembered as powerful figures who were unmatched. a piece.
As such, the weapons themselves are as legendary as their bearers, often associated with named weapon categories, or 'Meito'. Although the strongest weapons in the world are the highest grades, there are some weapons that are particularly powerful, but their classifications are currently unknown, so let's break down which ones these are.

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9
Napoleon is one of the strongest gentlemen of them all
Wielder: Big Mom
As one of the scariest Yonko and perhaps the most durable character we've ever seen, Big Mom is one of the strongest characters. a pieceAnd she wields a giant sword named Napoleon. Due to her Devil Fruit powers, she imbued the sword with a large portion of her own soul, making this weapon one of the strongest homies of them all that had a life of its own but was also highly destructive. However, fans never got an official classification, although the highest grade is not completely off the table for this weapon.
8
Hasaikai was controlled by a true demon
Wielder: Kaido
Even to this day, Kaido is considered by many to be the strongest opponent Luffy faced, and his main method of fighting was through the use of Haki and his large iron kanabo, the Hasaikai. Despite possessing one of the strongest Devil Fruits, Kaido primarily fought using Haki, and his Kanabo had been with him since his early days in the Rocks Pirates, so it's entirely possible that, through Kaido's many battles, the overall level of this weapon rose to some higher ranks.
7
Gryphon can possess a legendary Devil Fruit ability
Wielder: Shanks
Despite being the greatest Haki user of the current era, Shanks is also one of the strongest swordsmen in the world, considered equal to Mihawk himself. His sword, the Griffon, has a long history as his friend when he was still a teenager, leading many to think that it may in fact be the highest grade blade. Also, his battle against Eustass Kid saw him take the form of a large gryphon before his divine departure attack was released, leading many to speculate that the sword may have been his brother's blade and that the griffon, like Cerberus, had eaten the legendary Joan Devil Fruit.
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6
Cerberus has a very powerful ability
Wielder: St. Figurland Shamrock
Like his twin brother, Shamrock uses a sword as his main method of combat, automatically making him one of the strongest swordsmen in the series. His sword, Cerberus, has eaten the legendary Inu Inu no Me, Model: Cerberus Legendary Joan Devil Fruit, which gives him the power to summon the legendary beast to do his bidding. Since each member of the Figureland family has the same blade, many fans believe that they all have legendary Joann abilities and may even all be supreme grade weapons.
5
Harald's Sword was a massive and powerful weapon
Wielder: Harald
Davy D. to King Harald today. Along with Zebek, he is remembered as one of the strongest men of the old era, and his main method of fighting was through the use of his large broadsword. Due to his unparalleled mastery of Conqueror's Haki and his overall strength, he has been called in the same breath as other legends such as Xebec, Roger, Garp and Whitebeard, and seeing how these two characters confirmed to wield the highest grade weapons, many believe that Harald did the same.
4
Eclipse was the legendary blade of a legendary pirate
Builder: Davey D. J. Beck
Davey D. Jabek is known as the greatest pirate that time has forgotten, and his power is the greatest shown by the story as a whole. Like other top-tier fighters, Zebek used the sword as his main method of fighting, Oda revealed his saber, the Eclipse, as the strongest weapon to date that could destroy entire parts of the islands without being absorbed by Haki. As with Harald, Jabek's placement with Roger and Whitebeard confirms that his weapon is the highest grade weapon.

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3
The giant sword of Elbaf is still a huge mystery
Wielder: Unknown
When the Straw Hats finally arrived in the legendary land of the giants, one thing stood out to fans when they saw the island in its entirety, and that was the monumental sword sticking out of it. Although later chapters also reveal the ancient giants' titanic size and Loki's massive growth while within his legendary Zoan form, the blade itself is still too large for anyone to use in the current story, so it and its overall grade classification remain a huge mystery.
2
Ragnir is the legendary weapon of the ruler of Elbaf
Wielder: Loki
Ragnir was originally a giant warhammer who fed Ratatoskr the legendary Zoan fruit, bringing it to life and making it infinitely stronger as it could now affect lightning and ice. The weapon protected the Nidhog fruit for generations, meaning that no giant before Loki was considered strong enough or worthy to take it for 800 years, and its reputation is so legendary that even Emu himself recounts its presence. Ragnir is easily one of the strongest things a piece the story
1
Nemesis may be the original highest grade weapon
Wielder: Saint Nerona Emu
Of all the surprises that come after Emu's full reveal, Nemesis has to be one of the biggest. This weapon originally took the form of a polearm that looked like a black blade, though its most terrifying ability is that Emu can manipulate its true form by turning it into a mace, ball and chain, and eventually, a large blade called the Nemesis, the Sword of Justice. It's a no-brainer that this weapon is a supreme grade, although some fans also believe that it exists at a higher level.
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