Inside the apartment.
Karin, sitting on the bed, felt utterly drained.
"Finally, it stopped…"
She wiped the sweat beading on her forehead, her face still showing signs of shock.
The experience she just went through was terrifying for her. She had been sitting in her room, doing nothing, and yet her chakra had been completely drained.
Thankfully, just when she was on the verge of chakra exhaustion, the extraction stopped. Otherwise, she really wouldn't have known what to do.
In reality, with her current strength, she could have resisted this kind of extraction.
But out of concern for interfering with the leader's experiment, she had gritted her teeth and endured it.
At that moment, she glanced out of the window, murmuring, "Is the leader somewhere in the village?"
Undoubtedly.
When Shinji was extracting her chakra, her 'Kagura Mind's Eye' had pinpointed Shinji's location.
Looking in the direction where Shinji was, Karin felt curious. "I wonder how the leader did that—it's incredible!"
In the forest.
Thanks to the dual connection of 'Jikibi' and 'Wazunagi,' Shinji immediately sensed Karin's use of 'Kagura Mind's Eye.'
However, he wasn't surprised.
He had left the apartment and specifically moved to a small forest for the experiment, precisely to avoid being exposed by Karin's 'Kagura Mind's Eye.'
If he had stayed in the apartment, his location would have been revealed.
"The boost from just one exchange is so significant. If I do this regularly, won't my dojutsu continue to grow stronger?"
Shinji smiled as he began planning for future sessions.
Given Karin's robust constitution, as long as he controlled the amount of chakra he extracted each time, it wouldn't harm her.
As this thought crossed his mind, a flash of inspiration struck him.
"Karin's high-quality Yang Release chakra can stimulate my Yin Release chakra. Then wouldn't my high-quality Yin Release chakra also stimulate her Yang Release chakra and help her absorb and integrate the White Zetsu cells?"
This idea made Shinji eager to act.
Before, such a thing wasn't possible, but now it was different.
Just like with 'Susanoo Tomoshibi' and 'Jikibi,' the successful fusion of the Eternal Mangekyo Sharingan had enhanced 'Wazunagi.'
In the state of the Mangekyo Sharingan, 'Wazunagi' could only extract chakra from a spirit linked by 'Jikibi.'
But now, 'Wazunagi' could function as a two-way conduit.
In simple terms, Shinji could not only extract chakra from Karin but also transfer his own chakra to her remotely.
He could even extract chakra from others, like White and Deidara, and transfer it through his own body to Karin.
Of course.
Both extraction and transfer involved some loss of chakra.
Steadying his mind, Shinji initiated a new round of experimentation.
Instantly.
'Wazunagi' was activated again. This dojutsu, which could absorb chakra out of thin air, was now being used in reverse, allowing his high-quality Yin Release chakra to flow through the void and into Karin's body.
In the apartment.
"Hmm?!"
Karin was taken aback, stumbling backward and sitting back on the bed.
A large influx of chakra suddenly surged into her body, leaving her momentarily at a loss for what to do.
"Is the leader returning my chakra?" She paused, her expression shifting dramatically. "No… this… this isn't my chakra!"
In an instant, she realized that the chakra flowing into her body was a pure Yin Release chakra, unlike anything she had ever felt before.
As this Yin Release chakra entered her body, she immediately sensed a reaction.
Not only did her own Uzumaki Clan bloodline feel a strong stimulation, but the White Zetsu cells implanted in her also became restless under the influence of this Yin Release chakra.
"Could this chakra belong to the leader?! It's so pure, even more potent than the Yin Release chakra contained in my Mangekyo Sharingan. This is… unbelievable!"
Karin was deeply shocked.
She had transplanted a pair of Mangekyo Sharingan, and her body had already been exposed to high-quality Yin Release chakra.
As a result, ordinary Yin Release chakra couldn't provoke such a strong reaction in her.
And that's what baffled her.
During their previous gathering, she had heard Sasuke say that the Mangekyo Sharingan was the ultimate dojutsu of the Uchiha clan. Once one possessed a Mangekyo Sharingan, they stood at the pinnacle of the shinobi world.
After transplanting the Mangekyo Sharingan, she had indeed experienced the power of the Uchiha clan's ultimate dojutsu.
But compared to the Yin Release chakra being transferred from the leader, the Yin Release chakra of the Mangekyo Sharingan seemed insignificant.
Before she could dwell on it further, Karin felt her body undergoing some kind of change under the stimulation of this Yin Release chakra.
She didn't fully understand, but what she was experiencing was called 'Yin-Yang Fusion,' a prerequisite for drawing out All-Creation Power.
She instinctively sensed that the Yang Release chakra within her was becoming more active, its quality and quantity slowly increasing.
Next, she felt her arm heat up.
Rolling up her sleeve, she saw that the previously wrinkled area where the White Zetsu cells had been transplanted had become red and swollen.
The wrinkled skin in the transplant area seemed to have smoothed out significantly amid the swelling.
"What is this?!"
Her eyes went from surprise to delight.
Although she didn't fully understand cellular fusion, she recalled the leader mentioning that the wrinkled skin at the transplant site was due to her incomplete integration of the White Zetsu cells.
If she could fully integrate the White Zetsu cells, the wrinkles would smooth out.
Seeing the transplant area starting to flatten out, she was thrilled. It indicated that her integration with the White Zetsu cells had deepened.
Just as she was eagerly hoping for the wrinkles to smooth out completely, the flow of Yin Release chakra suddenly stopped.
In the small forest.
"Huff… huff… huff…"
Shinji was gasping for breath.
His chakra reserves weren't nearly as abundant as Karin's, and after transferring for a while, he had nearly exhausted himself.
This was after already absorbing a large amount of Karin's chakra. If he relied solely on his own chakra, the process would have been even shorter.
After resting and recovering his chakra for a bit, Shinji activated 'Jikibi' and entered the Jikibi space.
Then, he brought Karin's spirit into the Jikibi space as well.
Seeing the leader, Karin immediately asked, "Leader, what happened just now?"
Shinji, tapping his fingers lightly on the central table, casually replied, "I was testing a dojutsu. It allows me to extract your chakra and also transfer chakra to you."
"I see!"
Karin suddenly understood.
Shinji paused for a moment, then asked, "Did the Yin Release chakra I transferred cause any changes in your body?"
"Uh-huh!"
Karin eagerly described the changes she had just experienced in detail.
As he listened, Shinji thought to himself, "As expected, through 'Wazunagi,' I can safely exchange chakra with Karin, allowing us to enter a state of 'Yin-Yang Fusion.'"
'Yin-Yang Fusion' is a necessary condition for drawing out All-Creation Power, but that doesn't mean that without drawing out All-Creation Power, the process is futile.
In fact.
'Yin-Yang Fusion' itself is a form of training far superior to other methods. By conducting high-intensity 'Yin-Yang Fusion,' both Shinji and Karin could reap immense benefits.
For example, Shinji could enhance his dojutsu and improve the quality of his Yin Release chakra.
Karin, on the other hand, could further integrate with the White Zetsu cells and elevate the quality of her Yang Release chakra.
Thus, Shinji explained the concepts of 'Yin-Yang Fusion' and All-Creation Power to Karin and said, "What we just experienced was a shallow state of 'Yin-Yang Fusion,' where the Yin and Yang Release chakras in our bodies began a preliminary fusion."
"Yin-Yang Fusion… All-Creation Power…"
Karin was still a bit dazed.
These concepts were so advanced that they were hard for her to fully grasp at the moment.
Shinji, seeing her confusion, patiently explained, "You can think of it like this: When Water Release and Earth Release chakras fuse, they create Wood Release. All-Creation Power is the result of the fusion of Yin Release and Yang Release chakras."
This gave Karin a more tangible understanding.
Every shinobi in the Hidden Leaf knew the power of Wood Release. Yin and Yang chakras were much rarer and harder to control than Water and Earth chakras.
Using her basic understanding, she quickly deduced that All-Creation Power must be even more powerful than Wood Release.
However, she also thought of the difficulty of fusing Water and Earth chakras to form Wood Release and asked, "Leader, if it's so difficult to fuse Water and Earth chakras, wouldn't it be even harder to obtain All-Creation Power?"
"You're right." Shinji nodded slightly. "That's why, just now, we only entered a shallow state of 'Yin-Yang Fusion' without fully fusing the Yin and Yang Release chakras, and therefore, we didn't gain All-Creation Power"
In Shinji's view, achieving All-Creation Power required two essential elements:
First, high-quality Yin and Yang Release chakra.
Second, mastery over the advanced techniques needed to fuse these two chakras.
Without both, one could only maintain a shallow 'Yin-Yang Fusion.'
On the other hand, even if someone had the skills to fuse chakras, if their chakra quality wasn't high enough, they still wouldn't be able to draw out All-Creation Power.
In other words.
All-Creation Power demanded both extreme Yin and Yang chakras and peak-level chakra fusion skills!
Both were absolutely necessary!
Theoretically speaking, no matter how hard Shinji and Karin tried right now, it was impossible for them to draw out All-Creation Power like Uchiha Madara.
They were lacking in both chakra and technique.
Though Shinji had the Eternal Mangekyo Sharingan, he lacked the chakra of the Otsutsuki Indra reincarnation, so his Yin Release chakra wasn't at its extreme, and he didn't have enough of it.
Similarly, while Karin had transplanted White Zetsu cells, she still lacked the chakra of the Otsutsuki Asura reincarnation, so her Yang Release chakra wasn't at its extreme, and there wasn't enough of it.
Moreover, neither of them had mastered the technique required to fuse Yin and Yang Release chakras.
Shinji then waved his hand towards Karin. "Alright, go get some rest."
"Yes, sir!"
Sensing that the leader was deep in thought, Karin didn't ask any more questions and obediently left the space.
Shinji severed the connection, and Karin's spirit disappeared from the 'Jikibi' space.
In the now-quiet 'Jikibi' space, Shinji contemplated solutions.
First.
He needed to address the fundamental issue of chakra.
Shinji's current Yin Release chakra, in both quality and quantity, wasn't sufficient to draw out All-Creation Power
And since the current Otsutsuki Indra reincarnation, Sasuke, only possessed a pair of three-tomoe Sharingan, using Sasuke's eyes to steal the Otsutsuki Indra chakra wasn't yet an option.
"That means I'll have to rely on myself…"
Shinji's gaze darkened as he began to calculate.
Among the Mangekyo Sharingan he had in his possession, aside from the pair he had already fused with, there were three pairs left.
Out of these three pairs, Uchiha Fugaku's pair and the half-damaged pair were still intact.
The last pair was close to being completely ruined.
"If I could restore that ruined pair of Mangekyo Sharingan and use 'Susanoo Tomoshibi' to fuse them with another pair, I could create a second pair of Eternal Mangekyo Sharingan…"
He was once again reminded of this idea he had previously considered.
Now, with his current abilities, he could carry out this operation.
With the power of the Eternal Mangekyo Sharingan he already possessed, he could use 'Susanoo Tomoshibi' to forcibly fuse two pairs of Mangekyo Sharingan, bypassing the need for blood relations.
Moreover, with the enhancement of 'Susanoo Tomoshibi,' which now had an empty eye socket, he could easily handle using three pairs of eyes, using his own Eternal Mangekyo Sharingan as the base to fuse the other two pairs.
In this way, he would gain a second pair of Eternal Mangekyo Sharingan.
At that point.
Whether he decided to fuse this second pair with his own Eternal Mangekyo Sharingan to push his Yin Release chakra to its extreme or transplant it into Karin to help her suppress her Yang Release chakra for the eventual implantation of the First Hokage's cells, both options were viable.
Indeed, Shinji had already begun to consider implanting the First Hokage's cells into Karin.
Compared to obtaining extreme Yin Release chakra, achieving extreme Yang Release chakra was slightly easier.
Once Karin fully integrated with the White Zetsu cells, she could attempt to transplant the First Hokage's cells, which were even more dominant than White Zetsu's.
If that wasn't enough, she could even try implanting Naruto's cells, which contained the chakra characteristics of the current Otsutsuki Asura reincarnation, further enhancing the quality of her Yang Release chakra…