Both time-traveled characters ended up as villainous henchmen.

Night falls.

"Thank you, He Nian. Thanks to your help, my research and development progress on the Rumble Ball has improved significantly!"

Chopper waved goodbye to He Nian happily. With He Nian's help and his frequent insightful suggestions over the past few days, it had eliminated several major problems that had been hindering its research on Rumble Ball.

Chopper had a feeling that the Rumble Ball's official development was not far off.

"You're welcome. The most important thing is your own accumulation of knowledge in the study of Rumble Balls, and I have also learned a lot of useful knowledge from it."

He Nian waved goodbye to Chopper and left Chopper's laboratory, returning to his residence.

After observing and learning from Chopper for the past few days, he has roughly figured out the principles of the Rumble Ball.

The reason why Rumble Ball can disrupt the transformation wavelength of Zoan-type Devil Fruits is due to the special drug factors within it.

Once these drug factors enter the user's body, they stimulate the secretion of various hormones, thereby temporarily influencing the mind through physical means.

Users of Zoan-type Devil Fruits often possess physical abilities far exceeding those of ordinary people.

Stimulated by these hormones, those with abilities can more easily and smoothly enter the state of unity of body and mind, a state of spiritual and physical harmony.

After being stimulated and suggested by specific hormones, the "desire" within the Devil Fruit was affected, causing it to fluctuate and become disordered, thus weakening the "desire" residing in the Devil Fruit for a short period of time.

As a result, the individual's will plays a much larger role, even temporarily suppressing the "desire" within the Devil Fruit.

Furthermore, one can control the transformation of Zoan-type Devil Fruits according to their own will, allowing them to manifest in the desired state.

It has to be said, Chopper is a genius.

It not only touched upon the level of physical influence on the mind through the Rumble Ball, but also made a very accurate summary of the "desire" within Zoan-type Devil Fruits.

Based on this, the Rumble Ball, which targets Zoan-type Devil Fruits, was successfully developed.

"The transformation wavelength of Zoan-type Devil Fruits."

He Nian sat cross-legged on the bed, muttering to himself, "Chopper's research focuses mainly on Zoan-type Devil Fruits."

The most prominent feature of Zoan-type Devil Fruits is the transformation into an animal and the resulting powerful physical attributes.

If he wanted to develop a special body-strengthening technique based on the characteristics of the Rumble Ball, he would probably have to rely on various powerful creatures.

Aside from the powerful Zoan-type Devil Fruits like Ancient Zoan and Mythical Zoan in the One Piece world, the most powerful creature in the world today is only one type: Sea Kings.

By imitating sea monsters, corresponding body-strengthening techniques were created.

The thought crossed He Nian's mind, but he quickly rejected it.

Firstly, he has no chance of coming into contact with Sea Kings in the short term, and secondly, Sea Kings are far from being considered powerful by the standards of the pirate world.

Moreover, the effects of this kind of training based on specific organisms are probably not much better than the enhancement and transformation of Zoan-type Devil Fruits.

"Zoan type... Fruit... Enhancement transformation..."

As He Nian continued to ponder, all sorts of powerful fantasy creatures emerged in his mind, but he quickly rejected them one by one.

It's very simple. These fantastical creatures may be powerful, but they are all too illusory to him to be transformed into real power.

"etc……"

A thought flashed through He Nian's mind, and he suddenly remembered his greatest source of power: the Black Mist Space!

"Agumon! Pikachu!"

He thought of Agumin and Pikachumin, two versions of himself from the Digital World and the Pokémon World.

Both were fantastical beings, and they were not far from him; in fact, that power had long existed within him.

"Using Agumon and Pikachu as models, we will train by imitating them, while simultaneously drawing out the hidden power within us..."

He Nian's eyes grew brighter as she spoke, and she immediately jumped off the bed, took a stance in the room, and began to practice.

Since his target was animals, he easily came up with various animal-based martial arts, such as the Five Animal Frolics and Xingyi Quan.

The general content of these martial arts techniques had already been transmitted to him by He Nian through his memories. Now, as he entered a state similar to enlightenment, he quickly refined and simplified the content of these fist techniques and martial arts, combining it with the characteristics of the One Piece world to create a completely new theory.

By imitating the forms and spirit of Pikachu and Agumon, they continuously hone their physique and consciousness in order to resonate with the hidden power within their bodies and further strengthen their physical strength.

However, after rehearsing it several times in the room, He Nian quickly rejected the idea.

"The power of Pikachu and Agumon alone is not enough to unleash the latent power within me and further modify and strengthen my body."

He Nian muttered to himself, he needed a more powerful role model.

In that instant, He Nian recalled the first time he awakened Conqueror's Haki, when the power of the Black Mist Space briefly manifested in the One Piece world through the shell of Conqueror's Haki.

At that moment, his Conqueror's Haki transformed into a ferocious giant beast shrouded in black mist.

"If we build upon this and incorporate the characteristics of Pikachu and Agumon..."

Thinking of this, He Nian immediately sat down cross-legged again and began to try to visualize the giant beast that was a fusion of Pikachu and Agumon.

The power to control lightning and fire, an incomparably powerful dragon beast, and an absolute ability to suppress other beasts, especially dragons.

Most importantly, the possibility and potential for infinite evolution.

Gradually, a massive Chinese-style golden dragon, its form shrouded in black mist, surrounded by a large amount of lightning, spewing flames from its mouth, and its entire body shining like gold and jade, appeared within He Nian's vast mental landscape.

The golden dragon sometimes soars through the high heavens, sometimes dives into the deep sea, stirring up the wind and clouds with every move, attracting countless thunderbolts and flames.

Once the mental image was formed, He Nian immediately stood up, sensing the energy surging within his body and mind, and slowly imitated the movements and spirit of the golden dragon in the mental image.

At first, He Nian's movements were very stiff and awkward, and the flow of the golden dragon's spirit was also clumsy.

But as he practiced more, the hidden power within him was successfully activated, and his movements and spirit became smoother and smoother. He even managed to capture some of the mysterious and supreme feeling of the black mist space.

Time passed slowly, and He Nian's various physical training movements were constantly revised and simplified.

Finally, by dawn, He Nian had fixed the entire set of body-strengthening movements into thirty-six, taking the number of the Heavenly Gang, and called it the "Thirty-Six Forms of Dragon Transformation Stance".

Feeling greatly pleased, He Nian left his residence and, facing the morning snowflakes, began practicing again from the beginning.

Moreover, this time, he not only practiced the movements individually, but also mobilized the innate Haki within his body, using Conqueror's Haki as the finishing touch to the entire Dragon Transformation Stance Technique.

In an instant, it seemed as if wind and thunder were surging in the sky, and the surrounding snow and wind seemed to suddenly intensify.

He Nian looked calm and composed, his mind and body were in perfect harmony, there was no longer any barrier between his spirit and body, and he took another big step forward in the process of achieving unity of spirit and body!

hold head high!

With a phantom dragon roar, He Nian's Conqueror's Haki erupted on its own, condensing into a phantom golden dragon that soared into the sky!

In an instant, the dark clouds dispersed, the wind and snow stopped, and a ray of golden sunlight shone down on He Nian from the high sky.

The Golden Dragon Sky-Piercing Technique is complete!