One Piece: The user of the Nen-Nen Fruit, who overturned the sea.

Chapter 146 imparts the technique of "internal forging".

A region with 15 times the gravity.

Roy sat cross-legged at the junction of the inner and core areas, where the intensity of the lightning was just right.

The tempering of physique, the refinement of domineering aura, the honing of Devil Fruit abilities, the comprehension of rules...

Under Roy's immense mental power, the four training programs proceeded in an orderly manner.

Zefa's "Internal Forging Technique" was pushed to its limit under the pressure of gravity and the stimulation of lightning.

Armament Haki particles flowed through his blood, becoming more solid with each cycle.

His spiritual energy constantly emanated from his body, sensing every change in the energy around him.

While maintaining the gravity field, Roy is also trying to understand the 'essence of how the rules of this world work'.

Roy's previous series of "commands" were essentially temporary rewritings of the rules.

To truly master this power, one must first understand the rules themselves.

If Roy could permanently change the rules governing an area, then he would be close to awakening his Devil Fruit powers.

It is not impossible to achieve a scenario where "words become law" in the future.

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Time flew by during the cultivation.

One day, two days, three days...

Six months later, following Roy's mental connection, the pirate crew gathered in the outer area.

Of the group, only Vera, due to her weaker constitution, had not yet mastered the art of returning life.

The others have mastered the technique of returning life during the past six months of training.

As a "senior" among them, Savi is already skilled at using Life Return to accelerate injury recovery and can precisely control every muscle in his body during battle.

"Are you ready?" Roy asked Savi.

Savi patted his chest confidently: "Boss, I'm ready anytime!"

[At this point, I hope readers will remember our domain name: ①⓪①ⓚⓚⓢ.ⓒⓞⓜ]

Barrett looked at his younger brother Savi with some concern. From the few words Roy had spoken about cultivation, he also knew the dangers of the "internal forging" cultivation method.

"Hello!"

"Roy, let me go first. With my physique and the regenerative ability of the mythical beast, the danger should be the least."

Looking at Barrett who had interrupted, Roy slowly shook his head.

"Barrett, I know you're worried, but in terms of the ability to save lives, you're really no match for Savi and Tezzolo."

"And as a Zoan-type Devil Fruit user, Savi's mastery of his physical body is even greater than Tesoro's."

"So, let Savi go first. With my mental strength, I can stop him immediately if anything goes wrong."

"Yeah, Brother Barrett! Don't worry, I'm really strong now."

"All right!"

Seeing that Savi was very attentive, Barrett stopped him.

Roy nodded, gesturing for Savi to sit down next to him.

"The key to 'internal forging' lies in sensing the moment when Armament Haki particles are extracted from cells during the extraction process, and then integrating these energy particles into the bloodstream."

"While accelerating blood circulation, let the Armament Haki particles follow the blood flow."

"In this process, the Armament Haki particles will continuously collide and be tempered."

While refining his Armament Haki, he is also continuously strengthening his physique.

Roy looked at Savi in front of him.

"This process is extremely dangerous, and if it gets out of control, the Armament Haki will explode inside the body, with unimaginable consequences."

Roy's voice was serious.

"I will first use my mental power to guide you to perceive the particles of Armament Haki and enter the correct path, and monitor the entire process, but the core control must be done by yourself."

Savi took a deep breath and closed his eyes.

"Understood, boss. Let's begin."

"good!"

Roy extended his index finger and touched Savi's forehead.

Mental energy probed in like fine threads, simultaneously sensing Savi's physical condition.

"Now, enter the life restoration state, accelerate blood circulation, and perceive every subtle change in your body."

Savi's body gradually relaxed, his breathing became long and steady, and a faint warmth rose from his body.

"Very good. Next, extract Armament Haki, but do not release it externally. Instead, try to perceive its 'particle form' at the cellular level."

Savi frowned slightly, and fine beads of sweat appeared on his forehead.

This was more difficult than he had imagined—although Armament Haki is derived from the body's energy, to perceive and control its particle form at the microscopic level requires near-perfect control over the body.

Time passed second by second.

Ten minutes later, the black sheen on Savi's body began to flicker erratically, a sign of the unstable flow of Armament Haki within his body.

"Stay calm."

"Don't rush things; find your rhythm first."

Roy's voice entered Savi's mind directly through the mental connection, while at the same time he released his abilities to transmit his insights into Savi's mind.

Five minutes later, Savi suddenly opened his eyes, a flash of understanding in them.

"Found it! Armament Haki energy particles! So that's what it is?!"

"Okay! Take your time."

Roy's mental power gradually calmed Savi's restless heart.

"Use control over these particles to integrate them into the bloodstream! Circulate throughout the body with the blood."

Following Roy's instructions, Savi's inner turmoil gradually subsided.

Everyone present held their breath, afraid of affecting Savi's progress.

"very good!"

Roy's mental energy slowly intervened, amplifying Savi's perception and deepening his understanding of the technique of "internal forging".

At the same time, mental energy enveloped Savi like invisible tentacles, spreading to every corner of his body.

He could also stop Savi in time should anything unexpected happen.

Time passed slowly, and Savi's "internal forging" proceeded gradually.

But soon, Savi experienced the "pain" that Roy had described.

Those Armament Haki particles do not docilely drift along in the blood.

They collide and rub against each other as if they were alive, and each collision releases a tiny energy impact that stimulates the blood vessel walls and burns the blood itself.

"Well……"

Savi groaned, his skin began to turn red, and his veins bulged like writhing dragons.

"Take your time, Savi."

Roy's voice was soothing.

"This is normal."

"As Armament Haki particles travel through the bloodstream, they collide continuously, which strengthens blood vessels and body tissues."

Savi gritted his teeth and nodded, continuing to urge Life Return to accelerate blood flow while controlling the domineering particles to merge into his blood.

Time passed second by second.

Half an hour later, Roy withdrew his finger and let out a long breath.

"First guidance complete. Remember this feeling, and then slowly begin your practice."

Savi opened his eyes, exiting his meditative state, his eyes filled with joy.

"Boss, I feel like... my Armament Haki has come 'alive'!"

Savi clenched his fist, his arms covered in dark Armament Haki.

"See if you've gotten stronger?"

"It can't be that fast."

Roy gave him a flick on the forehead, clearly annoyed.

"Internal training is a gradual process that requires consistent effort day after day to see significant changes."

Roy withdrew his finger.

"Now is not the time to be smug. Quickly remember how you felt just now."