Kakashi's Kamuy Sharingan actually just barely reached the level of Mangekyō. Obito's was getting closer to the Eternal Mangekyō Sharingan because he transplanted the cells of the First Hokage, but it was not the Eternal Mangekyō after all. It just had an eye power that was infinitely close to the Eternal Mangekyō.

But at this moment, in Lin Tiannan's eyes, the patterns of the two Kamui Sharingan had changed.

On the original patterns of these two Kamuys, the lines began to show signs of bending. Although those bending marks were still unclear, one could roughly see the outline of Uchiha Madara's Rinnegan in the Naruto comics.

After being transplanted to Lin Tiannan, this pair of Kamui Sharingan not only became the Eternal Mangekyō Sharingan, but also further evolved towards the Rinnegan.

Lin Tiannan also gradually figured out the truth about the Sharingan.

The evolution of the Sharingan comes from two ways in the Naruto world. One is to stimulate the Uchiha clan with extreme emotions. When the stimulation is strong enough, the Uchiha will open the Sharingan, but the opened Sharingan will be limited by their respective talents and show the difference between one to three magatama.

For the three-magatama Sharingan to be upgraded to the Mangekyō Sharingan, it also requires extreme emotional stimulation.

But later on, if the Mangekyō Sharingan wants to be upgraded to the Eternal Mangekyō or even the Rinnegan, it needs to be fused. Fusion of the Sharingan of blood relatives can upgrade the Mangekyō to the Eternal Mangekyō, and fusion of the flesh and blood cells of the descendants of the ancestor's brothers can allow the Eternal Mangekyō to be upgraded to the Rinnegan.

However, the upgrade of the Eternal Mangekyō to the Rinnegan is not something that can be achieved overnight, but requires a lot of time to hone, just like Uchiha Madara in the Naruto comics, who conspired to seize the cells and flesh of Hashirama Senju in his prime, but did not successfully upgrade to the Rinnegan until he was about to die of old age, so he had to wait for the next rebirth before he could dance in the ninja world.

After studying and understanding the essence of the Sharingan, Lin Tiannan realized that the Sharingan is actually a blood-inherited ability that relies on mental power to advance and become stronger.

Stimulating one's own extreme emotions is a stupid method used by people in the Naruto world who don't understand mental power. Fusion of the eyes of blood brothers is also because one's own mental power has been stimulated to the limit and it is difficult to stimulate more, so the only option is to fuse external mental power.

Among external spiritual forces, blood relatives have the least rejection and are easiest to integrate.

But even so, reaching the Eternal Kaleidoscope was already the limit, so he merged with the body of the immortal. After all, the soul nourishes the spirit.

As the body becomes stronger, more mental power will naturally be generated.

It was precisely because the last fusion was to fuse the physical body that gave birth to the spiritual power, rather than directly fusing the spiritual power itself, that it would take decades for the Eternal Mangekyo to be upgraded to the Rinnegan.

Also because he guessed the nature of the Sharingan's advancement, Lin Tiannan has been cultivating the Sharingan with his own mental power day and night since he returned from Long Shanluo's hands.

And now, Dao has finally made his Kamui Sharingan begin to transform into the Rinnegan.

However, according to Lin Tiannan's estimation, unless he can break through to the Venerable Realm, it will take him decades or even longer, just like Uchiha Madara, to completely transform the Sharingan in his eye socket into the Rinnegan.

At that moment, Lin Tiannan did not use the long-range attack power of his right eye to destroy the spiritual force-like thing that was following and monitoring him. Instead, he used the defensive power of his left eye, which could only be used at close range, to make his body virtual.

Then, a mysterious and strange vortex appeared from Lin Tiannan's left eye and enveloped his body. In just an instant, he disappeared into the vortex and entered the divine power space.

In the lonely and desolate divine power space, Lin Tiannan's eyes were flashing scarlet, but in that scarlet, occasionally a light purple light similar to the Samsara Eye flashed by.

He was measuring the spatial distance and coordinate correspondence between Shenwei Space and the Earth.

At least, before the Kamui Sharingan in his eye sockets was completely transformed into the Rinnegan, Lin Tiannan would not be able to directly measure the coordinates of Xia Geng's corpse world across the Earth world in the Kamui space.

What's more, it is still unknown whether Xia Gengshi's world and the Earth world are adjacent to each other or separated by other worlds.

At that moment, after confirming the coordinates between the Shenwei Space and the Earth, Lin Tiannan once again virtualized himself and fell into the vortex that could transform between the two spaces.

When he emerged from the vortex again, he had already appeared in Zhongnan Mountain, directly at the light gate leading to Xia Geng's corpse world.

The surroundings were silent and quiet. There were no more shadows guarding the Black and White Academy, nor were there any third-level cultivators guarding the Black and White Academy...

Lin Tiannan sighed and stepped into the world of Xia Geng's corpse.

After entering Xia Geng's corpse world, Lin Tiannan did not rely on the divine power space to move his position again.

He didn't know where Zhou Buzhou was in this world.

And the best way is to let Zhou Buzhou see him.

Thinking of this, the sky blue Susanoo rose from Lin Tiannan's body.

The complete form of Susanoo, with huge wings growing on its back, carried Lin Tiannan to Tianshan.

Then, Lin Tiannan injected mental power and true energy into Susanoo, and with the injection of mental power and true energy, Susanoo became bigger and bigger.

In a blink of an eye, Susanoo had transformed into Pangu, the mythical figure who supported the heaven and the earth!

It truly permeates between heaven and earth.

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