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

"Uh... at least... it should look a bit high-tech, right?"

Savi scratched his head. In his memory, the doctor's laboratory was filled with all sorts of instruments that he couldn't understand but felt very powerful.

"It's not that complicated."

Roy flicked his finger, and all sorts of fruits on the table floated orderly into the box.

After doing all this, Roy put the still unconscious White Face CP into the box.

Then he took out a bottle of scarlet potion from his pocket.

"What is this!?"

Tesoro curiously leaned closer, looking at the viscous potion in Roy's hand that emitted an ominous red glow.

Others also cast puzzled glances. Apart from Roy, only Vera knew what it was.

"This is a 'one-minute slow-release neurotoxin' that I had Vera specially make."

Roy calmly answered Savi's question, his fingertips lightly tracing the cold potion bottle.

"It will not be fatal immediately, but will gradually block the transmission of nerve signals within a minute, starting from the extremities and slowly and irreversibly leading to brain death."

Throughout the process, the recipient will clearly feel their life force slipping away, but their bodily functions will gradually become paralyzed, rendering them unable to struggle, until consciousness fades away.

The atmosphere in the laboratory tightened slightly at the blunt yet chilling description. Even for pirates accustomed to life-or-death battles, this precise control over the process of death still sent a shiver down their spines.

"Why...why use this?"

Savi swallowed hard.

"For the sake of 'timing'."

Roy turned his gaze to the sea stone box.

"At the moment a Devil Fruit user dies, the 'devil' within their body 'escapes' and randomly attaches itself to a fruit."

"Vera's potion can control the time of death, so that the ability user can slowly die after we close the box."

Roy said no more, opened the potion, and used his mental power to control the injection into the unconscious CP's body.

After the injection was completed, Roy closed the seastone cap, sealing it completely.

At the same time, Roy pressed a button on the side.

Everyone saw that, following Roy's movements,

The transparent glass water tanks around the Seastone box rose rapidly like walls, completely enveloping the central Seastone box.

Immediately afterwards, icy seawater gushed in from the bottom pipes, instantly submerging the sea stone box.

The seawater shimmered with a deep blue light under the special lights, making the box look like a submerged coffin.

But this is not enough.

Roy closed his eyes slightly, and his invisible spiritual power surged out again, more solid and dense than before.

The silvery-white light outlined intricate patterns in the air surrounding the water tank, and these patterns quickly intertwined and overlapped.

This eventually formed concentric, translucent, ripple-like barriers visible to the naked eye.

Like a giant, slowly rotating cocoon, it wraps the entire tank and the sea stone boxes inside it layer by layer.

After completing all these meticulous precautions, Roy finally took out the palm-sized life monitoring device from his pocket.

The device was specially made by Dr. Gracia and is capable of using sophisticated biosignal sensors (pre-implanted in the body of the white-faced CP).

Real-time monitoring of the vital signs of the recipients inside the chamber.

The screen lit up, and under the soft blue backlight, several curves of different colors danced clearly:

A red waveform representing a heartbeat, green fluctuations representing breathing, blue ripples representing brainwaves… and a striking white countdown number, from…

Starting from "60", it decreases steadily, second by second.

59 seconds...58 seconds...Vera's neurotoxins began to circulate along the bloodstream, precisely targeting the peripheral nerves.

On the screen, a tiny waveform representing the nerve response in the finger flattened out first. Inside the box, the bound finger of the white-faced CP twitched slightly before becoming completely still.

50 seconds... The numbness spread steadily upwards like a silent tide.

The curves representing nerve signals in the ankle, wrist, and other areas successively went out.

The amplitude of the breathing curve began to become noticeably shallower, and the frequency also slowed down slightly.

20 second……

CP's breathing almost stopped, with only extremely faint, intermittent rises and falls of his chest.

My heartbeat was as slow as a pendulum about to stop, with each beat lasting several seconds.

10秒……5秒……4秒……3秒……2秒……1秒……

The moment the countdown reaches zero!

The three main curves on the screen—heart rate, respiration, and brainwave—showed almost the same change at almost the same instant.

It shuddered violently, then straightened completely, turning into three cold, flat lines without any further fluctuations!

Death arrived as scheduled at the precisely controlled end of the minute.

Everyone held their breath and waited quietly.

Ten minutes passed,

Everyone stared at the motionless box, at a loss for what to do.

"Hey! Roy!"

"Did it work?" Hawkeye asked first.

Roy also looked puzzled. Last time, when he was making the "storage bag," he clearly sensed the "devil" within the Devil Fruit using his mental power.

But this time, nothing unusual was found.

"This shouldn't be!" Roy murmured softly, stroking his chin.

"Could it be that Seastone is really that powerful!? Capable of completely sealing off the 'demons' that escape when a Devil Fruit user dies!?"

As time ticked by, the atmosphere in the laboratory gradually shifted from anticipation to confusion.

"Boss! Why don't we open it and take a look?" Savi suggested cautiously.

Roy frowned, staring at the motionless box enveloped by the seawater and the barrier.

"Then let's open it and take a look."

With a thought, Roy removed the layers of mental energy barriers surrounding him.

The silvery-white, ripple-like barrier vanished like the receding tide, revealing the deep blue seawater and the sealed box inside.

Then, he pressed another button on the console.

"Buzz..."

A low, mechanical hum filled the air as the transparent glass tanks that had risen on all sides began to slowly sink.

Seawater sank as it entered the tank, exposing the top of the box.

When the tank is completely submerged, the seawater quickly flows away through the drainage system at the bottom, leaving only wet watermarks on the ground and the surface of the tank.

Everyone immediately gathered around the box.

Savi couldn't contain himself any longer and grabbed the pull ring on the lid of the box. With a forceful pull of his arm,

The lid of the box slowly opened.

The scene inside the box came into view.

The first thing you see is the remains of the White Face Couple. Judging from their distorted faces, the poison Vera made must have been incredibly potent.

Savi excitedly reached into the box, preparing to take out the fruit one by one.

He first picked up the orange that was closest to him, then the banana, then the pineapple...

As the top layer of fruit was removed, a round fruit with strange spiral patterns on its surface and an eerie grayish-white color appeared before everyone's eyes.

"Test!"

"This...this was a success, right!?"

Savi pushed the other fruits aside and took this one in his hand.

"A Devil Fruit?!"