Naruto: You Call This A Medical Ninja?

The foundation of physical training had been firmly established through a variety of potions provided by Reiki. Combined with origin-enhancing potions, even those with mediocre talent could be nurtured into prodigies if they dedicated themselves to cultivation.

Black Zetsu's Suggestion

"Alright," Reiki said after some thought. "What's next?"

Black Zetsu leaned forward. "Orochimaru has made some progress in his research. Would you like to see it?"

Over the past months, Black Zetsu had split his time between assisting Orochimaru and monitoring Kaguya. This unusual proximity to others' lives gave him an unfamiliar, almost comforting sense of presence.

Reiki nodded. "Let's go. I have some questions for Lord Orochimaru as well."

Orochimaru's Research

Upon arriving at Orochimaru's lab, Reiki was greeted by the man himself, whose body looked unusually frail.

"How long have you been back?" Reiki asked, exasperated. "Your body looks like it's on the verge of collapse. Let me heal you first."

Orochimaru chuckled but didn't refuse. His experiments had clearly taken a toll on him.

Reiki handed him two potions: the origin potion and the spiritual source potion.

"Use these to strengthen your body and soul, Lord Orochimaru. Also, can you stop using your own body for experiments? Isn't that what Black Zetsu is for?"

Orochimaru smirked. "Black Zetsu's physiology is unique. Some experiments don't yield proper results with him."

Without further ado, Orochimaru retrieved a sealed box from a cabinet. Opening it revealed a test tube containing a pale, off-white substance.

"This," Orochimaru began with a glint in his eye, "is pure Yin-Yang chakra."

The Discovery of Pure Yin-Yang Chakra

Orochimaru explained, "I synthesized it by combining cells from the Shodaime Hokage with the Yin Release extracted from Black Zetsu. The results exceeded expectations."

He looked almost ecstatic. "With this, I've made a breakthrough. In the future, I might even be able to create a being with Six Paths-level power!"

Reiki studied the test tube, intrigued. "Lord Orochimaru, could I have this sample?"

Orochimaru raised an eyebrow. "Why? You're already more than strong enough without it. Your natural talent alone could surpass the Six Paths level."

Reiki shook his head. "I have other uses for it. Also, if I can provide you with everything you need to produce more of this, how long would it take to create a single batch?"

Orochimaru thought for a moment. "With sufficient materials, three days per batch."

Reiki grinned. "Perfect. I'll offer you a deal: one batch of pure Yin-Yang chakra in exchange for ten bottles of any potion you need."

Orochimaru scoffed. "That's a tempting offer, but I have other research to pursue. I can't focus on just one project—"

"Then I'll tell Master Jiraiya that you still haven't obtained the Sage Mode inheritance from Ryuchi Cave," Reiki interjected slyly. "He'll ensure you visit the cave… very thoroughly."

Orochimaru's eyes narrowed, but he relented. "Fine. Take this batch. I'll start producing more as soon as possible. But I expect those potions delivered promptly."

Reiki smiled, taking the test tube-filled box. "Thank you, Lord Orochimaru."

The Chakra Sacred Tree Plan

After leaving Orochimaru's lab, Reiki made his way to Shadowleaf Lake.

Standing by the water, he formed a hand seal. "Full moon!"

In an instant, Mochizuki, the enormous moonlit beast, materialized. Its shimmering form shrank as it perched on Reiki's shoulder.

"Take me there," Reiki said, his voice brimming with anticipation.

Mochizuki didn't question him. Opening a spatial vortex, the two disappeared into another world.

Rekindling the Chakra Sacred Tree

Reiki and Mochizuki arrived at a barren, desolate landscape—the remnants of the Chakra Sacred Tree's stump.

"Mochizuki," Reiki said, his voice filled with excitement, "we might be able to regrow the Chakra Sacred Tree in no time."

From the box, Reiki carefully retrieved six test tubes containing pure Yin-Yang chakra.

With a flick of his chakra scalpel, he opened the test tubes.

"Hiss…"

A radiant and potent aura of pure Yin-Yang chakra began to spread, enveloping the broken remnants of the tree.

Mochizuki's massive eyes widened as he watched the scene unfold.

Reiki, his hands glowing with chakra, stepped closer to the tree stump, determination etched on his face. "If this works, we'll have access to a resource unlike anything the ninja world has ever seen."

As the Yin-Yang chakra merged with the remnants of the tree, the ground began to tremble faintly, and an ominous yet hopeful energy filled the air.

This was only the beginning of what could reshape the balance of power in the entire world.