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

"However, there is a problem."

Just as Roy was feeling overjoyed at the success of the experiment, Dr. Gracia's voice interrupted him.

Gracia suddenly stopped smiling, her fingers flying across the keyboard as she pulled up a set of data and zoomed in to show it to Roy.

"Look here—he's using two abilities simultaneously."

The body's energy consumption rate is twice that of normal.

Roy didn't quite understand the data on the screen, but the red lines marked by Gracia were very intuitive—

Two curves, one fluctuating steadily within the normal range,

The other one spiked dramatically when the test subject used both abilities simultaneously, almost reaching the upper limit of the safety threshold.

"In other words, while multiple Devil Fruit abilities can be used simultaneously, the stamina consumption increases exponentially."

"right."

Gracia tapped the screen with the stylus.

"If an ordinary person needs to consume one bar of stamina to fight a battle, then a user with two Devil Fruit abilities would need to consume two bars of stamina to use two abilities at the same time."

This might be a fatal flaw for an ordinary person, but for—

He turned to look at Roy, his meaning clear even before he finished speaking.

Which of the core members of Beehive Island isn't a physical monster?

Barrett could exchange hundreds of punches with Garp without flinching, and Hawkeye could fight Aokiji for half a day without his swordsmanship faltering.

Tezzolo's Thunderous Strike could cover the entire Marineford.

This amount of physical exertion is not a problem for them at all.

"continue."

Roy took the third Devil Fruit out of the box.

"Let him eat the slippery fruit."

Gracia paused for a moment: "Trying the third one now?"

"Didn't you say his genes are stable now? Then strike while the iron is hot."

If the third one breaks, it means that the black beard's gene sequence can only accommodate two.

If it hadn't collapsed—"

Roy tossed the fruit to the test subject.

"That proves we really succeeded."

The slippery fruit is a fruit with a surface as smooth as if it had been coated with oil. It is pale pink all over and has a waxy sheen on its skin.

This fruit was discovered on a small island in the New World, and the local king presented it to Beehive Island as tribute.

In Roy's opinion, this fruit's potential wasn't top-tier, but its strength lay in its readily apparent ability—

It can make the user's entire body extremely smooth, so that physical attacks will automatically slide off.

The test subject bit into the third Devil Fruit under telekinetic command.

This time, the atmosphere in the laboratory was even more tense than before.

Gracia's hands were hovering over the keyboard, ready to press the emergency stop button at any moment. His face was pressed close to the monitor screen, his nose almost touching it.

The assistants behind him also stopped all their work and stared intently at the monitor screen.

The test subject's body began to change.

The orange cat's fur had a faint waxy sheen that spread from the top of its head downwards, as if someone had poured a layer of transparent oil on it.

The texture of the fur has changed—the originally fluffy orange cat fur has become smooth and tight, and when the light shines on it, it reflects an arc-shaped band of light.

"Gene sequence—stable!"

Gracia's voice trembled, but the data didn't lie.

The densely packed gene map on the screen showed no signs of breakage or distortion; each sequence was arranged neatly.

"Heart rate is normal! Blood pressure is normal! Cell activity—it's even slightly higher than before!"

Dr. Gracia turned his head and looked at the three fruit test subjects squatting on the ground.

He glanced at Roy again, his lips trembling several times before he managed to squeeze out a sentence:

"Captain Roy, this time it's a real success."

Roy walked up to the test subject and probed his brain with his telekinesis again, giving him three instructions at the same time: transform into an orange cat, change the color of his fur, and make his body smooth.

The experimental subject began to move.

First, the orange cat transforms, its muscles bulge, and its claws spring out. Then, its fur changes color, its body rapidly switching between seven colors.

Finally, there's the power of the Smooth-Smooth Fruit—his smooth fur reflects the light, making him look like a large, oiled orange cat.

All three capabilities operate simultaneously.

"The rate of energy consumption is three times that of normal."

Gracia pulled up the new data curve, pointing to the red line that was almost breaching the safety threshold.

"However, it is still within a controllable range. As long as it is not a long-term, high-intensity battle, it can be used perfectly well."

Roy withdrew his command, and the three abilities on the test subject dissipated simultaneously.

The orange cat returned to its squatting position, its tail sweeping unconsciously across the ground, its face still expressionless.

"PhD."

Roy turned around and looked at Gracia.

"When can we begin the transplant surgeries for the core members?"

Dr. Gracia did not answer immediately.

He walked to the monitor screen and reviewed the data from the entire experiment again—

The fluctuation curve of gene sequence, the peak and trough of heart rate changes, the rate of decline of cell activity, and the linear increase of energy consumption.

He zoomed in, took screenshots of each data point, and saved them into different folders.

After reading it, he turned his head, and the eyes behind his glasses had regained their cold, cautious look.

"Not now."

Why?

Roy leaned against the edge of the lab bench, arms crossed.

"Isn't the data perfect?"

"The data is perfect."

Gracia took off his glasses and wiped them.

"But this is a person, an experimental subject, an experiment."

In science, conclusions drawn from a single experimental subject are called individual cases and cannot be taken as general laws.

Each of your core members is a pillar of Hive Island. I can't gamble their lives on a hypothesis whose stability hasn't even been verified.

Roy was silent for a few seconds, then nodded.

He knew the doctor was right.

The fact that Blackbeard can hold multiple Devil Fruits does not mean that the genetic sequence he cultivated perfectly replicates all of Blackbeard's characteristics.

If there's some hidden flaw that only comes to light when it's actually implemented on core members, the losses could be enormous.

Who can blame them when they have multiple racial bloodlines and genes within them?

This slightly dampened Roy's initial joy at the success of the experiment.

How long do you plan to observe?

"At least three months."

Gracia put her glasses back on.

"Over the next three months, I will conduct a full set of stress tests on Subject Seven."

High-intensity combat, continuous use of multiple Devil Fruit abilities, and extreme physical exertion.

Record all his physiological data and compare them with those of people with normal abilities.

He paused, then added:

"In addition, I need to select a few more test subjects to test whether there will be any conflicts when eating Devil Fruits of the same type."

What happens when two Zoan-type characters eat together?

What would happen if two Paramecia-type characters ate together?

Can the natural sciences department coexist with other departments?

These all need to be tried one by one.

"Alright! Then I'll leave it to you!"