Lin Yu took a deep breath. He didn't overestimate himself. His chakra levels were insufficient to satisfy Kaguya, yet he couldn't use the Infinite Tsukuyomi as he wasn't the Ten-Tails jinchuriki and lacked the Rinne Sharingan.
Therefore, there was only one method: borrowing the power of nature and refining the inexhaustible natural chakra from the world.
Lin Yu slowly extended his right hand towards the Ten-Tails, voluntarily channeling his chakra into it. However, as his chakra touched the Ten-Tails' body, a massive suction force emanated from within, nearly causing Lin Yu to stumble.
This was not the Ten-Tails absorbing his chakra; it was the Gedo Mazo within him.
"Kaguya, you really know how to absorb."
"But you can only absorb what I give you. What I don't give, you cannot take."
Lin Yu immediately dispelled a shadow clone that was absorbing natural energy. He needed to reserve some of his own chakra to deal with Kaguya.
A vast amount of natural energy surged from Lin Yu, instantly putting him into Sage Mode. His aura became profound and mysterious.
However, the progress seemed slow. The Ten-Tails remained motionless, its six-tomoe Rinne Sharingan closed.
After a long while, Lin Yu had dispelled three shadow clones, and his own chakra had recovered halfway, with half being channeled out. Yet, the Ten-Tails showed no signs of movement, as if it were asleep.
At this moment, Black Zetsu, seeing the situation was ripe, immediately possessed the Ten-Tails, his yellow pupils flashing with excitement.
"Mother, you will reappear in this world once more."
"Onmyōton: Spiritual Possession: Assimilation!"
Black Zetsu felt a mix of tension and anticipation. Once Mother was revived, these humans would cease to exist. No one could stop Mother's advance, not even Uzumaki Lin Yu!
Today, he, Black Zetsu, would rise to power!
After a considerable pause, everything was calm. A gust of wind blew, and Black Zetsu blinked at everyone, saying awkwardly, "Perhaps today isn't a good day. Mother she..."
*BOOM!*
An unparalleled aura erupted from the Ten-Tails, instantly blasting Black Zetsu away and into a sand pit.
The previously closed six-tomoe Rinne Sharingan opened. The Ten-Tails roared while prostrate on the ground, its body contorting into irregular shapes. The surrounding equipment emitted "beep, beep, beep" red alarms, and instruments began to explode.
"This is bad. The Gedo Mazo seems to be counter-absorbing within the Ten-Tails. We underestimated the God Tree, or perhaps Black Zetsu awakened Kaguya Ōtsutsuki's will."
"No, that's not right!" Orochimaru stared at the red data displayed on the screen. The Gedo Mazo seemed like a beast, voraciously devouring everything within the Ten-Tails.
"This is the Ten-Tails' will. Two Ten-Tails are consuming each other. After absorbing Lin Yu's chakra, the Gedo Mazo is clearly stronger than the Ten-Tails. If this continues, the Ten-Tails will be devoured soon."
Lin Yu frowned. He wanted to sever the chakra flow from his hand but didn't want to waste his efforts.
*BANG!*
The Ten-Tails swelled again, completely losing its original form. Its body was in a state of irregular shape, appearing on the verge of explosion.
"We can't wait any longer. We must take action." Orochimaru frantically pressed buttons on the equipment and said to Lin Yu, "Proceed as planned. Pull the Gedo Mazo out of the Ten-Tails. In this situation, it should still be possible."
Lin Yu didn't respond to Orochimaru. He was contemplating which step had gone wrong, why Kaguya's will hadn't awakened. Or perhaps it had awakened but hadn't acted?
A brilliant golden light flashed in Lin Yu's eyes as he foresaw his future.
After a while, the golden light disappeared. Lin Yu uttered a single sentence and then resolutely leaped into the Ten-Tails' mouth, entering its body.
"I won't die. I'll go in and take a look. Don't worry about me."
The moment Lin Yu entered the Ten-Tails, all the instruments exploded. The Ten-Tails' size expanded into an irregular sphere floating in the air.
Obito emerged from Kamui's dimension, covered in dust. Looking at the devastated scene, his mouth twitched.
"The value of these instruments is enough for me to build a small comic book ninja village for Kakashi. What a waste!"
...
Inside the Ten-Tails, there was no imagined fierce battle. The original Gedo Mazo had already established itself within the Ten-Tails, seemingly intending to absorb all of the Ten-Tails' chakra and life essence to complete its own transformation.
Lin Yu discovered that the Ten-Tails and the Gedo Mazo had merged. However, their wills had not yet determined a victor, which was why the external form appeared irregular.
But how could he intervene in the battle of wills? How could he find Kaguya's will?
Lin Yu recalled Black Zetsu's words: chakra is the combination of spiritual energy and bodily energy. He also remembered Minato Namikaze leaving a chakra-consciousness body within Naruto to communicate with him.
He had found a way.
"All of it, at once, for you!"
*BOOM BOOM BOOM...*
In a certain valley, all the natural energy clones vanished. An unimaginable amount of natural chakra converged upon Lin Yu, who poured it all into the Gedo Mazo, along with his own chakra, filling Kaguya's body.
Then, Lin Yu sat cross-legged, closed his eyes, and entered a meditative state. Chakra was the spiritual connection between people, a unique product of the ninja world. He intended to use his own chakra to enter Kaguya's mental space.
After an unknown period, Lin Yu felt as if he had assimilated with the Gedo Mazo.
Slowly, a misty white space appeared before him, punctuated by occasional roars.
Lin Yu followed the sounds, and suddenly, a clear, cold voice echoed through the space,
"Who intrudes upon my domain..."