Inside the basement.
Blue-purple arcs of electricity flickered dazzlingly, flooding the silent basement with light.
"Alright, stop now—you've hit your limit."
As soon as Satori Hyūga spoke, the electric arcs vanished, leaving only one person gasping for breath.
A pungent odor of scorched protein lingered in the air, filling it with an eerie unease.
"Here, take this energy booster first. We'll continue experimenting afterward."
Satori's calm voice made Gongcheng Bei flinch involuntarily, fear flashing in his eyes.
"I can't go on anymore! My body has truly hit its limit—I can't produce any more chakra!"
"If we keep going, I will die for sure! You promised me you'd spare my life!"
He couldn't help regretting everything deep inside—if he had known being a test subject would be so agonizing, he would've chosen death over this.
Repeatedly extracting Lightning Release chakra and letting it surge through his body to activate his cells—
Over and over again—this was literally killing him.
At this point, his body felt completely drained, unable to generate even a drop of new chakra.
Looking at the clearly exhausted and slumped-over Gongcheng Bei, Satori stood in thought before retrieving a pale white substance that had long been sealed away.
This material had been stored for quite some time and hadn't yet been used up.
Now that Gongcheng Bei was completely spent, it could serve perfectly well to replenish his vitality.
After refinement, this pale oil produced chakra far less efficiently than standard sources—something Satori himself no longer considered worth cultivating.
But Gongcheng Bei didn't know that. Confused, he hesitated briefly before cautiously taking a sip when Satori offered it to him.
The moment it touched his lips, the oily texture spread quickly, then transformed into a warm current rushing into his body, reviving his drained body.
Gongcheng Bei stared wide-eyed at the small bucket of pale-white grease and gulped audibly, stunned.
"What exactly is this? Is it one of the clan's secret elixirs?"
As a regular ninja from the Sand Village who scraped by day to day, he normally relied only on Military Rations Pills to restore physical strength and chakra.
He had heard rumors before about how noble clans possessing bloodline limits or rare techniques had items far superior to military rations.
So when this pale-white oil appeared, Gongcheng naturally assumed it must be one of the Hyūga family's secret elixirs.
Still, the appearance and flavor of this supposed "secret medicine" were quite odd—after tasting it again, he was convinced it was just regular cooking oil.
Yet it clearly contained some unique energy, which precisely matched the energy and chakra lacking within his body.
"It's all for you. Drink up—get your strength and chakra back." Satori said indifferently.
His mood was quite good right now; he couldn't wait to begin the next experiment.
Now that he had built his own laboratory, he finally understood why Orochimaru was obsessed with human experimentation.
Human experiments yielded results at an astonishing pace. In just one day, he had already discovered how the Lightning Release affected cellular activation.
Judging from the previous dozen or so trials, the power of the Lightning Release was directly proportional to cellular vitality.
The stronger the cells' survival instincts, the more potent the Lightning Release, and the higher the chances of cellular activation—resulting in greater physical enhancement.
Under the stimulation of Lightning Chakra, cellular activation would rapidly initiate within a short period, greatly enhancing overall physical attributes.
However, after a certain amount of time following cellular activation, cell vitality slightly decreased. If sustained for too long, it could even lead to cell death.
In other words, there were both pros and cons—it all came down to instinct.
Satori Hyūga conducted countless experiments just to uncover the underlying patterns and formulas behind this phenomenon.
Once fully understood, he would be able to utilize Lightning Chakra to activate body cells and boost strength.
With long-term stimulation, physical traits like strength, speed, and reflexes could gradually improve. This allowed for steady enhancement over time.
And with short-term stimulation, one could temporarily unleash power far beyond their usual capabilities.
But this was merely the first step in the experiment.
What Satori truly sought was combining jutsu techniques—first researching Lightning Release cellular activation, then attempting to replicate the Cloud Village's Lightning Release Suit.
By that time, he would channel Lightning Chakra to activate his body cells, unlock the Eight Gates, and convert the chakra burst into the Lightning Release Suit.
This way, he'd achieve both powerful offense and defense, becoming invincible beneath the heavens.
Even against the Kage of the Cloud Village, he believed he could crush them head-on.
With this thought in mind, Satori cast a fanatical gaze toward Bei Gongcheng.
"Recover and we'll continue the experiments."
He laid out newly designed formulas and plans before Bei Gongcheng, giving him time to study them thoroughly.
Bei Gongcheng's eyes sharpened. He straightened his posture, studying the data and equations intently.
Although these experiments were painful, he had indeed felt his strength steadily improving.
His physical power continued to rise thanks to the Lightning Release enhancement, bringing significant improvements across all physical aspects.
Even the energy within his cells surged more powerfully than ever, allowing him to extract much greater quantities of Chakra.
This sensation made him involuntarily cooperate despite having previously hit a plateau in cultivation.
He might protest out loud, but his body betrayed him by cooperating.
No true ninja could resist such rapid strength gains.
After five or six more experiments, Gongcheng was completely drained, lying on the bed, eyes empty and dull.
Seeing his exhausted, listless condition, Satori mercifully let him off—for now—and turned toward another subject.
After all, he had two captives. It wouldn't be fair to torture only one person continuously.
The other ninja, who had been asleep for some time, had already woken up at the sound of Gongcheng's screams.
Yet he kept pretending to sleep, waiting quietly for a chance to escape.
Earlier, absorbed in serious experimentation, Satori hadn't paid attention to these minor antics—but not anymore.
In one swift movement, Satori closed the distance before the man had time to react, punching him straight in the stomach.
Thud!
The pain jolted Kondō out of his feigned sleep, his body writhing uncontrollably.
"Try anything sneaky again," he said coolly, "and I'll have no choice but to correct you."
As for anyone who had attempted to assassinate him, naturally, Satori bore no goodwill.
Kondō endured the abdominal pain, glaring at Satori with hatred in his eyes.
"You cursed Hyūga brat!" he spat. "Conducting human experiments—aren't you afraid someone will find out?!"
"While pretending to be unconscious, he also heard the anguished cries of his close companion, Bei Gongcheng. This only deepened his hatred toward Satori Hyūga.
"I only asked you to cooperate with a few experiments. I didn't take your lives, so I've already shown you plenty of mercy. Don't forget—it was you who provoked me first."
"You have only two choices before you now," Satori Hyūga continued coldly. "One is to submit to me, obey my orders, and carry out the experiments as required. The second... is to refuse—and be dissected by me."
Kondō glared at Satori Hyūga, his teeth clenched, as though he could eat him alive on the spot.
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