The more people you kill, the more skilled you become.

Among the jōnin gathered for the meeting, Indra, a mere genin, clearly had no place to speak.

As he waited for Tsunade's orders, bored out of his mind, he noticed a change in the All-Heavens Pearl.

As the All-Heavens Pearl's owner, Indra could sense that it had gained a "progress bar."

As long as the progress bar filled up, or his next chakra reincarnation body died, he would gain another chance to travel between worlds.

Indra keenly noticed that the progress bar had risen by a small amount recently.

"Was it when I killed those Hidden Stone and Hidden Sand ninja? Or when I saved Nawaki?"

After considering it, Indra concluded that those were basically the only two possibilities.

Testing it would be simple. He just needed to kill some enemy ninja.

When the meeting ended, Tsunade casually added, "Indra, Mikoto, come treat the wounded with me."

"Yes, Tsunade-sensei!"

Mikoto immediately answered, and Indra followed after her.

He could conduct the experiment anytime. There was no need to rush.

But having him treat patients...

Indra sidled up beside Tsunade, nudged her thigh with his elbow, and whispered, "I don't know any medical ninjutsu yet!"

"You? I wasn't counting on you in the first place.

"With Mikoto helping, that'll be enough. You little brat can just assist me.

"Better than running around the battlefield and dying somewhere without anyone knowing."

Medical ninjutsu was not something one could learn overnight.

Even though Indra had learned Monster Strength, Tsunade believed he still had a long way to go.

Unlike Mikoto, Indra had not focused on studying medical ninjutsu. No matter how hard he tried to catch up now, he could not possibly learn it that quickly.

"If you don't teach me, how do you know I can't? What if I can?"

Seeing how certain Indra looked, Tsunade burst out laughing. "You spent all that time studying under Mikoto's grandfather. You haven't even opened a basic medical ninjutsu book, have you?"

"..." Indra was left speechless. Watching Tsunade laugh without stopping, he indignantly declared, "Teach me first, then we'll talk!"

Faced with Indra's stubbornness, Tsunade smiled and taught him the D-rank Poison Extraction Technique and the C-rank Hemostasis Technique.

She also wanted to see just how talented Indra was at medical ninjutsu, considering how quickly he had learned Monster Strength.

These two medical ninjutsu corresponded to the first and second stages of a medical ninja's training, respectively.

Tsunade brought Indra a cup of milk coffee and gestured toward it. "I'm not expecting you to memorize all the medical knowledge. First, try separating these two liquids."

Indra took the milk coffee and released chakra to begin separating the liquids.

Strands of chakra flowed into the cup, enveloping every liquid molecule.

"My sensory ability seems to have improved. Is that the Sheep Talisman's effect?"

Having used the Sheep Talisman continuously, Indra could feel that controlling his chakra had become easier.

And whenever his chakra control became unstable, the Tiger Talisman hanging around his neck would faintly glow.

The power of balance, kid!

With the Tiger Talisman's assistance, Indra's chakra output remained incredibly stable, without the slightest mistake.

The milk and coffee mixed together in the cup gradually began to separate.

Several minutes later, the milk and coffee had completely separated into two masses, one above the other inside the cup.

"Huh? You actually did it?"

Having watched the entire process, Tsunade could hardly believe her eyes.

She seriously suspected that Indra had secretly practiced for a long time back in the village. Otherwise, there was no way he could have succeeded so easily on his first attempt!

Tsunade then handed Indra a dead tree branch and had him attempt the second-stage test. As expected, Indra failed.

"Phew~ Now that's more normal." Tsunade let out a long breath and stared at Indra as though she were looking at a promising sapling.

Since he truly had talent in this area, she naturally had to teach him properly.

"You definitely can't start treating people right away. Watch how I treat them from the side and first learn the essential basics of medicine."

Tsunade called Indra over and brought Mikoto with her to the first-aid station behind the Hidden Leaf camp.

Wounded soldiers lay one after another on the beds. Missing arms and broken legs were common sights, and most of them showed signs of poisoning.

The brutal scene left Indra silent. The dead bodies were not frightening; it was the wounded struggling at death's door that truly wrenched at his heart.

Tsunade treated people while explaining, but as more and more wounded were continuously brought in, she eventually made an exception.

There were too few medical ninja in the rear. Rather than let some of the wounded wait to die, it was better to leave them to Indra and Mikoto to treat.

As everyone knew, the more people a healer treated to death, the more skilled their medical arts became.

That sentence sounded like complete nonsense, yet it had now become reality.

Having furiously farmed experience from the wounded, Indra's proficiency in [Poison Removal Technique] and [Hemostasis Technique] soared in a straight line.

By the time the battle ended that night and Indra returned to the camp to rest, both medical ninjutsu had reached beginner level.

Lying in the same tent as Mikoto, Indra did not fall asleep from exhaustion.

He continuously refined chakra to replenish the excessive depletion from the day while looking at the All-Heavens Pearl.

"The progress bar rose... it was because I changed those people's fates.

"It seems that whenever I change someone else's fate, the All-Heavens Pearl can absorb some kind of energy.

"Previously, changing Nawaki's fate of death caused the All-Heavens Pearl's progress to increase by one segment.

"Most of the people I treated tonight were nameless nobodies, or people who would have survived anyway, which is why the progress bar increased so little."

Indra was delighted. He had finally figured out another function of the All-Heavens Pearl.

He took a deep breath and calmed his excited emotions.

Indra took out the Sheep Talisman, preparing to send his soul out of his body and mooch some of Tsunade's chakra.

Just as he was about to act, the orb of light within the All-Heavens Space glimmered faintly, and a mass of chakra burst out from it.

"Another chakra reincarnation body died?"

What else was there to say? Indra immediately went happily to loot the All-Heavens Space.

After gleefully devouring his own chakra inheritance, Indra's aura surged severalfold, and he broke through to the level of a Chunin in one go.

As Indra browsed through the memories of that chakra reincarnation body, a completely different kind of energy gathered in his dantian.

Qi!

The instant this mass of qi came into contact with chakra, the two immediately fused together.

At their core, both were his "power," so there was no rejection whatsoever.

This chakra reincarnation body of his came from the Under One Person World.

It had reincarnated during the Republican era. Orphaned and alone from childhood, it later became a disciple of the Three One Sect.

Because it had reincarnated through chakra, it possessed considerable talent in cultivating qi, and was thus accepted as a disciple by the Great Surplus Immortal, Zuo Ruotong.

It failed to stop the battle between Zuo Ruotong and Wugen Sheng, and Zuo Ruotong still saw through the Reverse Birth Triple Layer, realizing that this technique could not lead one to heaven or allow one to become an immortal.

However, after some persuasion from the chakra reincarnation body, Zuo Ruotong held on for a while longer and preserved the Three One Sect.

Yet from then on, the Three One Sect was no longer a mystical sect, but continued to exist as an ordinary martial sect.

Upon learning that the Reverse Birth Triple Layer was not a path to immortality, many disciples left, and the entire sect declined within a short period.

In the years that followed, the chakra reincarnation body cultivated the Reverse Birth Triple Layer diligently in an attempt to restore the sect's former glory, while also actively resisting the invasion.

In the end, while killing Japanese devils, it encountered an ambush by the Bihu Mountain Ninja Group and armed troops.

It did not possess Zuo Ruotong's strength, and its cultivation had not even reached the second layer of Reverse Birth. As expected, it died on the battlefield.