Inside the capsule, under the current's stimulation—
Kai narrowed his eyes and savored the sensation.
His body was getting stronger.
His cells became far more active under the intense provocation.
And with that stimulation as a catalyst—
His attributes across the board surged forward.
Strength.
Physique.
Endurance.
Even Ghost Back Completion—normally slow like a snail—began to rise dramatically.
At a rate of 0.001% per minute.
It sounded slow—
But in truth, it was terrifying.
Kai had spent days grinding before, and his Ghost Back progress had only crawled up by a tiny fraction.
Yet today, under electric stimulation, his progress was exploding.
"Still not enough."
Kai's eyes flashed.
Through the transparent glass, he spoke to Zephyr again.
"Instructor Zephyr—raise it further."
He wanted stronger current.
This still wasn't his limit.
The stronger the stimulation, the greater the growth.
Kai understood that perfectly.
So he demanded higher intensity.
That was how he could get stronger faster.
Outside the capsule, Zephyr couldn't hear Kai clearly—
But he could read Kai's lips.
Turning toward the control room, Zephyr said solemnly:
"Raise the current by one tier."
"Set it to Level Four."
The moment those words fell—
The researchers looked at each other, alarmed and uneasy.
A four-year-old…
Training under Level Four?
Could he really endure that?
"Captain… are you sure this won't cause an accident?"
A researcher asked weakly, trembling.
If something went wrong, they'd all be finished.
The team leader gritted his teeth, voice firm.
"Follow Admiral Zephyr's order."
"If he dares to command it, he won't let that child risk his life."
"And besides…"
"With Admiral Zephyr's strength, even if an accident happens, he can rescue him immediately."
"So don't panic."
With the team leader's command, the researchers hurried to raise the output.
Higher and higher—
Until it reached…
Level Four.
Level Four was terrifying.
If an ordinary adult entered a capsule under Level Four stimulation, they'd be killed instantly—
Their body might even be scorched into ash.
That was how frightening Level Four was.
As the researchers adjusted the current—
Kai felt it immediately.
The electricity flooding the capsule became violently intense.
Zzz—zzz—zzz!
Currents flashed wildly, coiling around his body and bringing repeated burning pain—like sharp iron needles stabbing from every direction.
Even with Kai's monstrous physique, Level Four still produced real pain.
Each current strand was like a needle—
Striking him again and again.
And it wasn't just surface pain.
With every breath, ultra-intense current poured into his body—
Tempering his internal organs.
"Hiss—"
Kai couldn't help sucking in a cold breath.
He could endure the pain on the outside…
But the pain inside his organs made sweat bead on his forehead.
After a long moment—
Kai forced himself to endure it, gritting through the stabbing torment.
"This level…"
"Should be my current limit."
"If we raise it again…"
"I might not be able to hold out."
He steadied his breathing.
This level was perfect.
Under this intensity—
His cells became wildly active.
His power, physique, vitality—everything—rose crazily.
His growth rate was several times faster than before.
"Stronger current…"
"Faster growth."
The two were directly linked.
"If I can do this kind of electrotherapy every day…"
"My strength will definitely undergo a massive leap."
"Before long…"
"I'll truly reach Vice Admiral-level combat power!"
Kai's eyes shone with expectation.
And so—
Time passed.
An hour later, the current shut off.
The capsule door opened.
Kai stepped out.
His whole body looked half-scorched, his hair standing up from the electricity, and he looked a bit disheveled.
But his eyes were bright.
His spirit was blazing.
Excitement filled his face.
He clenched his fists—
Feeling power inside them like it could shatter the heavens.
This wasn't an illusion.
After one hour of electrotherapy training, he was stronger again—significantly stronger.
Just this one hour—
Had been more effective than his usual three days of nonstop devil training.
"Hah…"
Kai let out a heavy breath and immediately summoned his status panel.
"System—pull up my attributes."
[Host: Kai]
[Strength: 38.2 (+1.3)]
[Speed: 31.2 (+1.5)]
[Stamina: 39.5 (+1.2)]
[Mental Power: 19.2 (+1.1)]
[Ghost Back Completion: 11.69%]
[Current overall training effect boost: 100x!]
These were Kai's results from a single hour.
Terrifying.
In just one hour, his strength had undergone something close to rebirth.
Normally, to get gains this large, he'd have needed at least three full days of grinding.
But this time—
He only spent one hour.
That was the horror of electrotherapy training.
Kai lowered his gaze from the panel, grin impossible to hide.
"Not just my base stats…"
"Even Ghost Back Completion jumped a lot."
"More than what I got from the last three days of training."
"This electrotherapy method really was made for me."
Kai laughed, deeply moved.
Coming to Marine Headquarters really had been the right choice.
Otherwise—
How would he ever have thought of training with electric stimulation?
Only a behemoth with massive foundations like Marine HQ could come up with something this extreme.
After the session, Kai felt no side effects at all.
His body was overflowing with vitality.
He rolled his shoulders—
Crack crack crack—
A crisp popping sound came from his bones.
His upper body muscle lines were clearly defined.
Veins bulged like coiling centipedes across his torso.
Muscles rose.
Pressure radiated.
That Ghost Back—like a devil's imprint—looked more and more distinct.
Hideous.
Terrifying.
And getting clearer by the day.
"How do you feel?" Zephyr asked with a smile as he watched Kai step out.
"Better than I've ever felt," Kai replied, voice full of heat and exhilaration.
It was true.
After this stimulation training, his state felt peak.
He wanted to fight immediately.
His blood felt like it was boiling over.
"It looks like electric stimulation training suits you perfectly," Zephyr laughed. "I told you—this was tailor-made for you by the top brass. You wouldn't be disappointed. And these three days you waited weren't wasted."
Zephyr looked at the four-year-old in front of him, and a powerful premonition rose in his heart.
The future of the Marines…
Really might rest on this kid's shoulders.
In this era, no one had the right to stand beside Kai.
"I'm looking forward to the day you surpass me," Zephyr said, patting Kai's shoulder, his voice sincere.
He could feel it.
The moment Kai stepped out of the capsule—
He was stronger than before by far more than one or two notches.
That was why Zephyr could only marvel at Kai's heaven-defying talent.
Kai…
Was truly an unprecedented monster.
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