Wu Pifu Discovers the Key Detail!

Sea Fiend Port City was one of the largest port cities in the first half of the Grand Line, as well as one of the World Government's key military zones in that region. At least three Vice Admirals and one Admiral were stationed there year-round. Every few years, a Marshal of National Defense would even descend upon the city to deter all manner of petty scoundrels.

At this moment, Hade, the Admiral stationed here and wielder of the Crab-Crab Fruit, Mythical Zoan, River Crab Model, was fidgeting uneasily.

As a Mythical Zoan Devil Fruit, it was far rarer than even Logia Fruits and powerful Paramecia Fruits. The River Crab Model was hailed as one of the Devil Fruits capable of contending for the strongest in the world. The previous wielder of the River Crab Model had been known as the strongest Admiral—unmatched below the Ascendant Body realm, and capable of trading one-for-one even above it.

The Crab-Crab Fruit, Mythical Zoan, River Crab Model possessed a rule-based power, and its rules operated on a world-class scale.

Within the Mountain and Sea Realm, anyone who obeyed the rules would suffer a percentage-based reduction in strength when facing a River Crab Model user. The more strictly they followed the rules, the greater the reduction, potentially reaching as high as ninety-nine percent. Meanwhile, those who disobeyed the rules would suffer a lesser reduction, and if they not only ignored the rules but actively broke them, their strength would instead receive a percentage-based increase when facing a River Crab Model user.

It sounded as if this Devil Fruit became a liability against lawless madmen, didn't it?

No, that was not the case, because these "rules" were the rules established by the Heavenly Dao of the Mountain and Sea Realm!

In other words, so long as