One Piece: Evaluating the Grades of Mysterious Weapons

Overview of Weapon Mastery in One Piece

Exceptional weapon skills elevate characters like Mihawk and Shanks to legendary status.
Weapons such as Napolean and Kikoku exemplify the strength and iconic nature of top-tier characters.
The colossal swords from Elbaf and Onigashima are potentially the most formidable weapons in the series.

The pursuit of power in One Piece is intricately linked to the mastery of weaponry. Many of the most formidable figures in the series have achieved their remarkable strength through honing their skills with various arms, positioning themselves in a rarefied league of elite warriors. Masters of swordsmanship and wielders of diverse weapon types—such as Mihawk, Shanks, and Roger—demonstrate the profound impact of weapon proficiency on their prowess.

Moreover, the weapons wielded by these iconic characters are equally renowned for their power and craftsmanship. Generally, the finest weapons in One Piece belong to the strongest combatants and often register unmatched strength. Yet, alongside these established weapons exist some enigmatic items whose classifications remain uncertain. This article explores several significant yet mysterious weapons and their potential rankings.

Trafalgar Law’s Cursed Kikoku

Likely Classification: Great Grade Blade

First Appearance	One Piece, Chapter 498, “The Eleven Supernovas”
Story Arc	Sabaody Archipelago

Kikoku stands as one of the more mysterious weapons within the One Piece universe. While it is indeed recognized as a Meito, or “named blade,”its precise rank remains elusive, leading many to speculate it qualifies as a Great Grade sword. A significant characteristic of Kikoku is its status as a Cursed Sword—one of the few confirmed in the series alongside the Kitetsu lines—though the specifics of its curse on the wielder are still unknown.

Often labeled as the “Surgeon of Death,”Trafalgar Law’s blade is notably longer than traditional swords found in the series, while still retaining its katana classification. Although Kikoku has not demonstrated exceptional feats independently, Law’s adeptness in wielding it is evident—particularly when he amplified its length during a battle against Big Mom, displaying the weapon’s formidable capabilities.

Big Mom’s Napolean Homie

Likely Classification: Supreme Grade

First Appearance	One Piece, Chapter 651, “A Voice From The New World”
Story Arc	Fishman Island

Big Mom’s weapon, Napolean, generates considerable debate regarding its classification. This unique sword is a homie—a living entity created by Big Mom merging a portion of her soul with a sword, thus imbuing it with tremendous power. As one of her signature homies formed alongside Prometheus and Zeus, Napolean holds a pivotal role in Big Mom’s arsenal.

Despite strong arguments for classifying it as a Supreme Grade sword due to Big Mom’s formidable status, critics suggest that Napolean’s strength derives primarily from the fragment of Big Mom’s soul rather than the sword itself. Even without formal Meito classification, Napolean remains a formidable weapon in its own right.

Likely Classification: Supreme Grade

First Appearance	One Piece, Chapter 824, “Whim”
Story Arc	Wholecake Island

Kaido’s signature weapon, Hassaikai, also falls into the category of enigmatic weaponry. This kanabo serves as his primary means of inflicting damage, especially when enhanced by his Conqueror’s Haki, boosting its already significant power. Given Kaido’s stature as an Emperor of the Sea, many believe Hassaikai to be a Supreme Grade weapon.

A less-discussed theory proposes that Hassaikai’s distinct black color may signify a ‘Black Blade,’ resulting from the absorption of Kaido’s Haki. However, this theory is dubious, as the weapon’s coloration likely stems from its metal composition rather than any mystical properties.

The Giant Swords of Elbaf and Onigashima

Likely Classification: Supreme Grade

First Appearance	One Piece, Chapter 1130, “The Accursed Prince”
Story Arc	Elbaf

As the Elbaf arc develops, the immense sword embedded in its landscape becomes a profound mystery. Though little information is available, its size dwarfs even the giants of Elbaf, suggesting it could be one of the most powerful physical weapons in the entire One Piece saga.

It is worth noting that another colossus, a katana buried in Onigashima, shares a similar monumental stature, leading to speculation about an ancient race of even larger giants. Should this theory hold, both the Elbaf and Onigashima swords could well be classified as Supreme Grade weapons, possibly the strongest in the One Piece world.

One Piece is available for streaming on Crunchyroll.

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