"Tailed beasts, what magical creatures."
Looking at the tailed beast chakra that kept recovering even after being consumed, Uchiha Kiyo exclaimed sincerely.
Even when separated from the body, it could still absorb natural energy from the environment to restore itself.
"Although there is a limit to this recovery, based on observations, it is already remarkable to be able to recover naturally."
Uchiha Kiyo had his own theories regarding the limits of a tailed beast's chakra recovery.
Perhaps the key difference between tailed beasts and other creatures lay in their souls.
Unlike ordinary beings, a tailed beast's soul and body were one.
That is, they were fully integrated.
Severing a part of a tailed beast also meant dividing a portion of its soul.
And the limit of the chakra a severed part could regenerate was related to the resilience of this fragment of the soul.
As for whether a tailed beast's severed limbs could regenerate, Uchiha Kiyo attributed it to the nature of the tailed beast's soul.
The soul of a tailed beast was highly malleable, and when part of its body was lost, the remaining soul would distribute itself evenly, restoring the body.
However, even though the soul adjusted, the chakra of the tailed beast was ultimately diminished.
That said, the chakra lost in such cases was relatively small.
Uchiha Kiyo theorized that a tailed beast's soul had a core essence—the part directly tied to its life and death. This core essence carried the majority of the chakra that the tailed beast's soul could handle. As long as this portion remained intact, the beast's chakra levels would not drop significantly. However, damage to this core part of the soul often signified the death of the tailed beast.
Therefore, no matter how many limbs were lost, the overall reduction in chakra remained minor.
Observing the tailed beast chakra continuously replenishing the large formation, Uchiha Kiyo roughly calculated the formation's consumption rate and the beast's chakra regeneration speed.
His conclusion: the tailed beast's chakra recovery was more than sufficient to sustain the continuous operation of the formation, as its regeneration outpaced the formation's consumption.
"Good. This means I can conduct my experiments without restrictions in the future.
Additionally, with this endlessly regenerating tailed beast chakra, I can further study its mysteries."
"This portion of tailed beast chakra extracted from the Earth and Stone clone is a full hundred lons. Occasionally using some for research won't be an issue. If it can even be cultivated and strengthened, this fragment of the soul might have the potential to increase its upper limit.
But ultimately, that doesn't hold much significance."
Lacking interest in nurturing tailed beast chakra, Uchiha Kiyo placed the severed tail of the Three-Tails at the core of the formation. He simultaneously applied a sealing technique, allowing him to extract chakra at will to maintain the formation's stability.
After securing a portion of the tailed beast chakra, Uchiha Kiyo left the formation's core.
"Since we met, let's update things while I'm here. I'm on my own, and I don't need much help from you."
Earth and Stone: ...
After updating the Earth and Stone clones, Uchiha Kiyo dismissed them from his base.
Upon returning to the ninja world, the Earth and Stone clone was dumbfounded when he heard the rumors about his battle with the Three-Tails.
What peak Kage-level strength? That wasn't him!
"Ontology, what have you done?! Why did you update me and throw me into this mess?"
"Ugh, I need to lay low for a while..."
Finding a safe place, he used the Annihilation and Recovery technique to report back to the main body before seeking a hiding spot for the foreseeable future.
Meanwhile, Uchiha Kiyo was deep in his studies of the tailed beast chakra when he suddenly received the memory transfer from the Earth and Stone clone.
After processing the memories, he wore an odd expression.
"Wait... how did the Earth and Stone clone end up labeled as a peak Kage-level fighter?"
"Lies. This has to be misinformation."
"Danzo, did you do this?"
"I didn't provoke you, and yet you targeted me?"
"Fine. Just wait. I'll make you regret it soon!"
"Sooner or later, you'll pay for this!"
With a huff, Uchiha Kiyo adjusted his mood and returned to his research.
A true scientist wouldn't let distractions interfere with their studies.
Tailed beasts were most likely created by the Sage of Six Paths using Yin-Yang Release, perhaps through dividing the Ten-Tails. But the core method had to be Yin-Yang Release.
So, what exactly was Yin-Yang Release?
In Uchiha Kiyo's mind, Yin-Yang Release had always been an incomparably profound technique.
Was it a fusion of perfected Yin and Yang Releases? Or was it merely a cooperative use of the two?
If Yang Release governed the creation of the body and the manipulation of matter, then Yin Release controlled the creation of the soul and the manipulation of the immaterial.
Was Yin-Yang Release the combination of these two powers to create both body and soul simultaneously? Or was it a true fusion, granting both properties within a single technique?
By studying the chakra of the tailed beast, Uchiha Kiyo made some discoveries.
Tailed beast chakra was different from a ninja's chakra. Not only did it contain chakra, but it also shaped the beast's physical form. There was a trend of materialization within it.
At the same time, Uchiha Kiyo detected soul fluctuations within the tailed beast chakra.
That is, a tailed beast's body and soul were fused with its chakra.
This was not merely a unity of body and soul—it was a complete fusion.
Thus, the art of creating a tailed beast required both soul and body creation at once.
"So, the Yin-Yang Release that created the tailed beasts was a true fusion of Yin and Yang, not just a cooperative technique."
To differentiate, he labeled the fusion as "Yin-Yang Release" while referring to the cooperative technique as "Yin and Yang Release."
Was Yin-Yang Release, then, a bloodline limit created by fusing Yin and Yang?
"No, perhaps it's even more complex."
"There might even be levels to Yin-Yang Release."
"This ties back to Yin and Yang Release..."
In ordinary terms, Yin Release and Yang Release were separate attributes. However, the power of Yin and Yang inherited by Indra and Asura from the Sage of Six Paths was different.
Those abilities were not pure Yin or Yang but rather a fusion of them with elemental properties.
Thus, a fully realized Yin-Yang Release could include multiple elements.
"So, the highest level of Yin-Yang Release is the Bloodline Net, and only the most advanced Yin-Yang techniques reach this level."
The Otsutsuki clan on the moon may have mastered only basic Yin-Yang techniques, far from the power wielded by the Sage of Six Paths.
"It's likely just cooperative Yin-Yang techniques. True fusion is incredibly difficult."
Of course, all of this remained theoretical. Studying tailed beast chakra alone had its limits.
Still, Uchiha Kiyo was certain that the technique used to create tailed beasts was a true fusion of Yin and Yang.
"Let's shift focus to other aspects of the Three-Tails' chakra."
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