An uninhabited island near Amazon Lily.
Rayleigh held the silver-white scabbard in his left hand, looking solemnly at Luffy across from him.
"Are you sure? This isn't just talk; you could die if you're not careful!"
"Mhm, don't worry, Uncle Rayleigh. Don't forget, I have the ability to see into the future!"
Luffy grinned at Rayleigh, his tone very casual.
However, a tall figure suddenly blocked Rayleigh's path. "Absolutely not, Rayleigh. Even you cannot do this."
"That's enough, Hancock!!"
Luffy stretched out his arm, wrapped it around Hancock's waist, pulled her aside, and smiled at her.
"Don't worry, it'll be fine. Just stand back a little, okay?"
"But I am worried about you!!"
Hancock's eyes were filled with worry, especially considering Luffy's idea... However, Luffy just smiled at her, and Hancock could only reluctantly step away.
Ten thousand meters away, Law lay quietly on a large boulder, with the *Kikoku* beside him.
As for Bepo and the others, they had been sent to the New World, and Jinbe had taken the Straw Hat Pirates' flag and headed to Fish-Man Island.
"Then let me witness the true power of the legendary Pluton!!"
Law gazed into the distance with interest; ever since joining the Straw Hat Pirates, he felt younger, and his mind was more agile.
"Then you must... be careful!!"
As soon as he finished speaking, Rayleigh slowly extended his right hand and gripped the sword hilt.
*Zzzzz...* Wild, black-red lightning surged around his body, solidifying like a hurricane.
The moment he took a step onto the ground, the earth within a ten-meter radius instantly shattered, kicking up countless fragments of rock.
*Boom!!*
An earth-shattering aura erupted.
Black-red lightning, like long snakes, wildly generated from the razor-sharp longsword, suddenly blooming around his figure like a boiling net of electricity.
—*Whoosh!*
Rayleigh transformed into a streak of light and rushed toward Luffy.
Every pore on Luffy's body burst open at that moment.
This strike carried an aura so potent that even ghosts and gods would have to retreat... Luffy's pupils constricted violently, and a chilling coldness surged into his heart, making him feel as if he had fallen into an ice cellar.
He had to block it, otherwise... he would die!!
In the next instant, ink-black Armament Haki covered his chest.
*Clang!!*
A crisp hum resonated.
—*Sizzle!*
The roaring sword aura, like a magnificent crescent moon, instantly tore through Luffy's Armament Haki.
*Pfft!!*
A gush of blood blossomed on his chest.
"Kamisari!!"
Rayleigh sheathed his sword, and Luffy's figure was sent flying backward like a cannonball, as if struck by a high-speed warship, creating white circular air waves along his flight path.
His sandals plowed through the ground. Blood spilled from Luffy's mouth as he looked down at the slash wound on his chest and muttered,
"Kamisari, huh? That really is strong!!"
The intense pain made him frown slightly. At the same time,
Constitution +0.08, Constitution +0.06, Constitution +0.05... Armament Haki +0.08, Armament Haki +0.01... Worth it, it was all worth it!!
That's right, Luffy's plan was to "take" the Kamisari head-on, actively developing his bloodline factor to enhance his Constitution and Armament Haki!
The effect was instantaneous, though the drawback was that Advanced Armament Haki would deal with anyone who had strong recovery abilities.
Didn't Garp's punch leave the legendary "Phoenix" bandaged for hundreds of chapters?
Luffy grimaced as he felt the changes in his body. Well, at least he could take another hit of "Kamisari" in an hour!
In the distance, Law stared wide-eyed, utterly astonished and filled with disbelief.
"This... is the Pirate King's subordinate?!"
Beside him, Hancock tenderly helped Luffy up, watching his once-white shirt stained crimson with blood, dripping onto the ground.
"Rayleigh! Couldn't you have been gentler?!"
"Uh!!"
Rayleigh scratched his head, feeling helpless; a man could never understand a woman's thought process.
He then gazed at Luffy's figure and murmured, "An 'Indestructible Body' like Kaido's?!"
This was truly astonishing; after all, Kaido's title as the "World's Strongest Creature" relied heavily on that "Indestructible Body."
That body, which could only be harmed by advanced Haki, was a headache for all strong fighters... —*Clang!*
Two figures shifted in the low air; instantly, blades flashed and shadows danced, making every step perilous.
"Not bad, young man!!"
Rayleigh casually parried a strike, said lightly, and mercilessly slashed with his longsword.
—*Whoosh!*
The longsword left behind an afterimage, the crisscrossing sword light screamed, cutting through all obstacles on the mountainside.
Law, a hundred meters away, watched the mountain peak split in half, cold sweat beading on his forehead.
This old man truly wasn't afraid of him dying. What if he had been even a moment slower... "What are you thinking about?"
A calm voice rang out.
Immediately, Law didn't hesitate. He held his left hand loosely, opening his domain. "ROOM!"
In an instant, Law teleported a hundred meters away.
—*Swish*
Rayleigh's figure appeared where Law had been.
Law waved his left hand, and the rocks and trees within the domain suddenly rose into the air, hurtling toward Rayleigh all at once.
"ROOM: Scalpel!"
*Rumble!!*
Dust and sand instantly flew up, obscuring Law's vision.
Suddenly, a blue sword light tore through the air.
Law frantically tried to resist.
—*Clang!*
The sword and blade collided, and Law was instantly swept away.
"This is far enough!!"
Rayleigh looked at the pale-faced Law, who was clearly "exhausted," and said calmly.
Following this, Rayleigh began customizing the training plan.
"Trafalgar Law, your swordsmanship and Devil Fruit ability work well together and form a good system.
However, your constitution is too weak!!!
Therefore, the next stage of training will focus on swordsmanship, Devil Fruit ability, constitution, and the two types of Haki."
"As for Luffy, you need to address your shortcomings!!"
"Me? Shortcomings?!"
Luffy was slightly confused.
"Resistance to the sea. This is training almost all powerful Devil Fruit users (except Big Mom) need to undergo."
Rayleigh was extremely patient with Luffy.
The sea has always been the nightmare of all ability users.
Countless people want to eat a Devil Fruit but don't want to be rejected by the sea... Where is the good fortune in that?!
However, this vast sea contains various different creatures and races, but the fundamental principle for all creatures, whether powerful or weak, to become stronger... lies in the word 'adaptation.'
Survival of the fittest!!!
Adaptation is truly a terrifying thing.
Marine creatures evolved lungs to adapt to land environments;
Animals evolved cold-resistant fur to adapt to frigid climates. (Pseudo-Evolutionary Theory)
Even the sea's curse can be adapted to. After extensive, high-intensity resistance training, one will still have energy remaining even if they unfortunately fall into the sea.
However, the vast majority of people are not qualified for this kind of training, as the path of evolution always leaves countless discarded individuals.
Therefore, a powerful Devil Fruit user is not necessarily fearless of seawater, but a Devil Fruit user who is fearless of seawater is definitely ridiculously strong.
"So that's it!!"
Luffy suddenly understood. No wonder he once kicked Kizaru into the sea, and the man was completely fine afterward.
In an instant, Luffy's eyes sparkled.
"I want to learn that!!"