One Piece: Nobody knows Devil Fruits better than me.

Chapter 41: It's time to show your true talent! Give me some points!

Blackbody flow.

This name, which wasn't particularly eye-catching, still held a certain allure for Roy at that moment.

He thought to himself, no wonder Zephyr could train a kicking master like Kizaru, and also a boxing champion like Akainu whose legs are only used for walking.

So this person's physical skills are not just 'fist techniques', but physical skills that train the whole body.

So at this moment, he was quite excited.

Because he also knew that physical strength and skill were indeed the foundation of everything.

This is true even for those with special abilities.

Not to mention that the power of a Devil Fruit requires physical energy to use.

A strong physique and physical skills alone can provide a huge boost to an ability user.

For example, Admiral Aokiji.

As Garp's disciple, he learned 'Iron Fist' and successfully mastered it.

Combined with the power of the Ice-Ice Fruit, the force of his iron fist is truly terrifying.

As for Roy, he has a Devil Fruit ability with almost no limit. If he also has strong enough physical skills to perfectly utilize his Devil Fruit ability, then he will not be far from truly standing at the top of the world!
But while excited, Roy was also somewhat puzzled.

If Zephyr's 'Blackbody Flow' only involves training the whole body, then theoretically anyone could learn it.

Just like Garp's iron fist.

You can tell from Koby, a young man who won't join the Navy for several years.

Anyone can train in 'Iron Fist' as long as they're not afraid of breaking their arm.

But it's amazing that Zefa hasn't found a true successor after all these years.

At this moment, Zephyr seemed to be able to see Roy's doubts.

But he didn't explain, he just shook his head: "'Black Body Stream' is a bit special - ability users can't cultivate it at all, and most people can't withstand the training environment."

At this point, he glanced at Roy.

"I have observed you for a long time before I was certain that you would not lose your life because of this—you will soon know the specifics."

"what?"

Upon hearing this, Roy exclaimed, "Did I hear you wrong? Did you just say something about 'losing your life'?"

That sounds a little unsettling.

Before he could finish speaking, he saw Zephyr nod to Binz.

Binz went directly to a corner of the training room and found a control panel there.

"Hey, wait a minute, it's me."

Roy was about to say something, but before he could finish, he had already spoken.

next moment.
"Crack!"

As Binz pressed a button on the control panel, the platform beneath Roy's feet suddenly split open.

Roy could even see that beneath the platform was a void.

At the end of the cave, you can still see the azure sea!

"Get ready, let's go!"

At that moment, Zefa laughed heartily.

"etc."

Before Roy could react, he saw the pipe above his head suddenly extend downwards.

"boom!"

An extremely powerful gust of wind pressure swept over, and Roy instantly felt his body uncontrollably falling downwards along the pipe.

Upon seeing this, Zephyr did not hesitate and jumped down with him.

After falling for a very long time...

"Boom!"

With a heavy thud, he finally fell to the bottom.

"hiss!"

Of course, given Roy's physique, this kind of fall injury, which would have been enough to make an ordinary person reincarnate ten times, only made him hiss slightly.

"Boom!"

Immediately following, Ze Law also fell heavily to the ground from above.

Only now did Roy realize that he and Zephyr were still inside that pipe.

The pipe is semi-transparent, and you can vaguely see that it seems to be wrapped in a layer of colorful things, while outside there is only pitch-black silence.

"Coating?"

Roy instantly recognized the origin of the seven-colored object—a coating technology unique to this world.

"Is this...the deep sea?"

Therefore, he immediately realized where he was.

“That’s right, this is 5000 meters below the sea level—the limit that can be reached by SSG’s specially designed ‘coated extension pipe’.”

Zephyr nodded and casually pulled a coated bubble from the pipe next to him and put it on Roy's head.

"This is also the first lesson you will learn." Upon hearing this, Roy was completely bewildered.

He already had a vague idea of ​​what Zephyr meant by the 'first lesson'.

And as expected.

The next moment, he saw Zefa grin, revealing a set of big white teeth.

"Go!"

With that low growl, he raised his foot and kicked Roy in the butt.

Before Roy could react, he was kicked out of the pipe—the pipe was made of some unknown material, and it seemed to have a coating that could be penetrated.

And at the moment of leaving the pipe.
"Uh!"

Roy felt the icy seawater instantly engulf his body.

Then he felt the pain!

That was excruciating pain emanating from his entire body.

Every inch of his skin, every bone and muscle, and even every cell in his body seemed to be bombarded by a tremendous force at this moment.

Roy even felt his bones and muscles making a constant cracking sound as if they were being torn apart.

Of course, Roy knew what it was—it was the water pressure that inevitably existed in this deep sea, enough to crush steel into a pancake!

At this moment, Ze Law, who was in charge of the coated pipe, watched this scene and his slightly tense body relaxed a little.

His voice, transmitted through the coating, clearly penetrated the seawater and reached Roy's ears.

"Did you feel it, Roy kid?"

He said so.

"We need to train every part of the body, which is very difficult—no matter how precise the normal exercise is, it is impossible to train every part of the body equally; there will always be weaknesses."

"But the ocean can help you."

There was a clear sense of pride in the general's words.

Using the deep sea as a hammer and water pressure as an anvil, he forged the physique of a strongman—this is the fundamental logic of the 'Black Body Flow' that he researched and has been practicing ever since.

Upon hearing this, Luo Yi, who had been somewhat bewildered, suddenly realized what was going on.

"No wonder it requires an extremely powerful physique and recovery ability, and why ability users cannot cultivate."

It would be strange if someone with superpowers could cultivate their abilities while training their body at a depth of 5000 meters.

Meanwhile, Zephyr continued speaking.

"However, don't think that's all there is to blackbody flow."

"I've been testing your physical data recently. It's amazing, but it's still not enough. You're far worse than I was back then."

Zefa said in a deep voice.

"Therefore, you are still unable to undergo real formal training for the time being—I have set a training goal for you. You need to adapt to the water pressure here within a month."

"Only after your body becomes more resilient will I take you for formal training."

His words were very serious, as if a homeroom teacher were saying, "You are the worst class of students I have ever taught."

But in reality, Zephyr's eyes were full of admiration.

Because Zefa knew very well that what he had just said was only half true.

He did indeed make an accurate assessment of Roy's physical strength through the tests conducted over this period, which is why he dared to bring Roy here.

Roy's physical strength is indeed a little lacking, and he needs some time to adapt to the water pressure here.

But
"He's already a monster for getting here without using any Haki."

Zefa was well aware of this.

He was a true genius in the Navy back then, and he had almost never encountered an opponent along the way, except for a very few people like Garp and Sengoku.

He did indeed create the 'blackbody flow' at a depth of 5000 meters underwater—but when he created the blackbody flow, he was already a top-tier master of dominance.

It was only after a considerable amount of time, thanks to the combined effects of his domineering aura and physical prowess, that he was able to train here.

But Roy doesn't exude any domineering aura; he can withstand the water pressure of 5000 meters simply by relying on his physical strength—this is a truly monstrous physique, far surpassing his younger self.

This is also the source of Zefa's expectations.

He took many detours in developing the 'black body flow' back then.

By the time the Blackbody Flow technique was perfected and perfected, he was already quite old, his body was past its peak, and some old injuries prevented him from fully unleashing the limits of the Blackbody Flow technique he envisioned.

But
"he can."

Looking at Roy, whose face was contorted in agony under the pressure of the water, Zephyr felt an overwhelming sense of anticipation.

But at this time.
"A month to adapt before starting formal training? Does that mean this isn't formal training yet?"

At this moment, Roy was unaware of Zephyr's thoughts, so he could only frown slightly.

"It takes a month just to get used to it, and if you add the formal training that follows, it's going to take way too long."

Roy thought to himself.

"I have other things to do next."

so.
"It's time to show your true talent!"

"Fruit Encyclopedia - Give me some points!"

　Regarding speaking underwater, in the manga, Luffy seems to be able to speak while wearing a protective coating in the deep sea, so I've assumed the coating has a sound-conducting function (probably). Mainly, I'm just too lazy to write another dialogue device.
　　
　
(End of this chapter)