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

In the days that followed, the training gradually got back on track.

Every morning, everyone undergoes basic physical training under the pressure of the Sea Stone;

The morning was dedicated to refining and honing each individual's abilities.

The afternoon session is for sparring practice;

The evenings are dedicated to a deep cycle of "internal forging."

Roy himself did not slack off in his training either.

The 95% pure seastone bracelet completely neutralized his Devil Fruit ability.

But Roy gained a completely new understanding of "internal forging" under these extreme conditions.

"The circulation of Armament Haki in my blood... has become more 'solidified' under the suppression of Seastone."

On the evening of the third day, Roy shared his findings after finishing his practice.

"Because of the all-around physical weakness caused by Seastone, the Overpowering Particles need to stick together more tightly to maintain circulation."

This actually increased the efficiency of 'forging'.

Roy explained the benefits of using "Internal Forging" under the suppression of the Sea Stone.

This also fueled everyone's enthusiasm for the upcoming training, as the Roy Pirates were eager to improve their strength.

Who can blame them when this team has three incredibly strong guys—Roy, Barrett, and Hawkeye—who are also obsessed with training?

Don't let Roy's seemingly busy role as the team leader fool you; his endless stream of ingenious methods...

With the swordsmanship of a great swordsman, how could one have reached such a level without hard work?

Despite Hawkeye's aristocratic appearance, he has never stopped honing his swordsmanship.

Barrett, needless to say, is a pure cultivation fanatic; he's either training or on his way to training.

With the influence of these individuals, how could the members of the Roy Pirates not be concerned about improving their strength?

They didn't want to hold their comrades back in future battles.

Because of this, in the following period, in addition to basic training and sparring,

He then devoted more time to training in Armament Haki 'internal forging'.

The unusual behavior of Roy and the others during their training was quickly noticed by the members of the Beasts Pirates.

However, aside from Yamato, that reckless guy, who would ask Roy questions when Roy returned to the outer perimeter to replenish his energy.

Roy easily fooled him with some excuse.

Three months passed by in the midst of busy training.

Just as Roy was about to lead everyone back to Wano Country to end their training.

Dr. Gracia, who was far away on Ghost Island, was the first to call.

"Captain Roy, there's something I need to report to you. The bloodline transplant experiment... has encountered some problems."

"What's the problem?" Roy walked to a quiet spot.

"Our first batch of fusion clones has matured and has been used in small-scale transplantation experiments as planned."

"The rejection reaction has indeed been greatly reduced, and the survival rate of the test subjects has reached over 85%, which is a great success."

The doctor paused, his tone becoming puzzled.

"However... the bloodline talent displayed after the transplant was far below expectations."

Roy listened quietly to Gracia's report.

"The clone itself can exhibit about 80% of the Oni race's physical strength and regenerative ability, but after being transplanted into the experimental subject, the effect is only 30%-40%."

"The situation is even worse for the Lunaria race; the clones can only reach 70% of Lord Jin's level, and after transplantation, only 20% remains."

"Furthermore, after the transplant, the body will not have the same wings and fire abilities as Jin; only physical strength and surface defense will be increased."

"Have you analyzed the cause?" Roy asked, frowning, after listening to the doctor's explanation.

"The initial assessment is 'adaptive decay'."

The doctor explained,

"During the cloning process, the bloodline genes and the clone's body form a stable new gene sequence."

"But when we extract the genes and transplant them into a new host, this stable gene sequence will be broken."

Bloodline genes need to readjust to the new environment, leading to a significant decrease in their effectiveness.

Dr. Gracia added,

"What's more troublesome is that the degree of attenuation is inversely proportional to the host's own physical strength—"

"The stronger the host, the smaller the attenuation; the weaker the host, the greater the attenuation."

Based on this trend, even if the physique were transplanted onto someone like Kaido, the effect would be reduced by 70% to 80%.

Roy fell into deep thought.

This is indeed a tricky problem.

If the transplant effect is only 30%-40% of the original, then investing a lot of resources in bloodline fusion is not very meaningful.

Suddenly, a thought flashed through Roy's mind.

"Could it be because the transplant was just done and the gene sequence of the experimental subject hasn't stabilized yet? Is there any possibility of gradual improvement later?"

Roy's question startled Dr. Gracia on the other end of the phone, followed by the sound of rapid typing.

"Theoretically... that's certainly possible!"

The doctor's voice rose slightly with excitement.

"I focused too much on short-term data comparisons and neglected the 'plasticity' and 'growth potential' of genes!"

Roy, hearing the doctor's mutterings, continued:

"Doctor, think about it. Although we are transplanting genes from a mature clone, it is not the host's original bloodline."

It needs time to "take root," "grow," and "integrate" in the new body. Perhaps the decline we see is just a temporary phenomenon in the early stages of transplantation.

"That's right! You're absolutely right!"

The doctor's voice became completely excited.

"I immediately redesigned the experiment, adding a long-term observation group!"

By adjusting the breeding program, we might be able to implant "growth-inducing factors" during the cloning stage.

To make transplanted bloodline genes more adaptable to the new environment!

"very good."

Roy nodded.

"Then, Doctor, you continue to optimize the plan, and we'll continue training on Raijin Island. If you need anything, just contact Kaido, and they'll find a way to help you."

"good!"

"Click!"

After hanging up the phone, Roy returned to the group and briefly explained the situation on Ghost Island.

No one thought anything of it, after all, their strength was still growing rapidly.

I'm not that concerned about external reinforcement.

Seeing that no one seemed to be in any hurry, Roy wasn't anxious. After all, in his opinion, his companions all had good potential.

Their strength is still growing rapidly and they are far from reaching their limits.

Moreover, the doctor's experiment has not yet reached a stable state.

So Roy and the others continued their training here, since the environment on Thunder Island was too conducive to rapid improvement in strength.

"Since the doctor needs more time, let's continue our cultivation here."

Roy surveyed the crowd on the training field, his tone firm.

"The improvement effect of the environment on Thor Island on us is obvious to all."

"In the time to come, we must work even harder and strive to take our strength to the next level before returning to Wano Country."

"Yes!" Everyone responded in unison after eating Roy's "pancake".

While they anticipate the potential benefits of bloodline transplantation, they do not rely on it.

What truly convinced them was the genuine improvement in strength resulting from their own rigorous training.