I will use the ninja world to aid my cultivation of immortality.

The evolution of the Rinnegan requires the chakra of Indra and Ashura to be combined.

Even so, Madara Uchiha only developed the Rinnegan when he was very old.

Therefore, even if one possesses the Eternal Mangekyou Sharingan, which inherits Indra's chakra, and Hashirama Senju's cells, which inherit Ashura's chakra, it is not certain that one can cultivate the Rinnegan.

Well, Naraku is different.

He supplemented it using weapon-refining techniques.

Through his refinement, Hashirama Senju's cells were perfectly integrated into the Eternal Kaleidoscope.

Furthermore, through divine insight, it was fully possible to discern that with the integration of Hashirama Senju's cells, the Eternal Kaleidoscope was undergoing a transformation.

Although this transformation is very slow, taking at least several years, it undoubtedly proves that Naraku has mastered the method to evolve the Rinnegan.

As for where his Hashirama Senju cells came from.

Then we have to thank Konoha for their gift.

During the Konoha Crush, among the vast resources he plundered from the Anbu base was a portion of Hashirama Senju's body tissue.

After observing the transformation of the three [Eternal Kaleidoscopes], Naraku flipped his hand and put them back into his body.

At the same time, when the three [Eternal Mangekyou Sharingan] entered his dantian, it could be seen that Naraku's dantian not only contained the remaining [Mangekyou Sharingan], but also more than a dozen [Tomoe Sharingan], including many three-tomoe Sharingan.

Although Naraku did not use the Uchiha clan as breeding stock.

However, he still maintains strict control over the Sharingan.

Just like how Fugaku Uchiha was able to find replacement eyes back then.

Although the Uchiha clan did not completely seize the Sharingan of the deceased, they still preserved a certain number of Sharingan in order to prepare for any eventuality.

Now that the Sharingan that were preserved have been confiscated by Naraku as the Uchiha clan joined the Land of Stars.

Similarly, from the moment they joined the Land of Stars, whenever someone within the Uchiha clan who had awakened the Sharingan died, their Sharingan had to be handed over to them.

Of course, he is still very well-mannered.

He would provide appropriate material compensation for anyone who surrendered their Sharingan.

This compensation, while not enough to completely eliminate any resentment from the Uchiha clan, was still quite reasonable for them, given Naraku's status.

evening.

Inside the Uchiha clan chief's residence.

"Shisui is one of your clansmen. If you want him to mentor Itachi, you can arrange it yourself." Naraku said lazily, playing with the large lamp on the bed while holding the woman in his arms.

"Hmm!" Uchiha Mikoto, still recovering her health and even twitching involuntarily, responded weakly.

Seeing that the beautiful married woman was so easily defeated, Naraku, who was playing with the large lamp, thoughtfully gathered the Heavenly One Divine Water and injected it into her body.

With the nourishment of the Heavenly Divine Water, the beautiful wife quickly recovered and even subconsciously climbed onto Naraku again, finding a good spot to sit down.

"What, still not satisfied?" Naraku looked at the married woman on top of him with amusement.

"His Majesty has been coming less and less lately."

Coming to her senses, Uchiha Mikoto buried her face in Naraku's shoulder with some embarrassment, but still couldn't help but mutter a resentful whisper.

Snapped! !

Naraku slapped Mikoto's shapely buttocks, causing her to tremble and move even more forcefully.

"What nonsense are you thinking? I've been busy cultivating lately," Naraku scolded.

Upon hearing this, Uchiha Mikoto, who had been feeling resentful, immediately brightened up.

It wasn't that His Majesty was tired of her; it was for the sake of cultivation.

With her mood brightening, Uchiha Mikoto became even more energetic, even turning her head to passionately kiss Naraku's cheek.

With each 'visit'.

The beautiful married woman's mindset also changed time and time again.

until now.

Even though Naraku never accepted Itachi Uchiha as his disciple, Mikoto Uchiha never complained.

This is because the body and soul of this beautiful married woman have both taken the form of Naraku.

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Chapter 279 Qi Refining Perfection

Yaoguang Hall.

One after another, the True Qi Shadow Clones, having exhausted their spiritual energy to the limit, automatically dissipated, converging the absorbed spiritual energy into Naraku's body, who was seated in the center.

At the same time, while refining the spiritual energy fed back by his clone, Naraku was also consuming one True Essence Pill after another.

A balance between tension and relaxation—this was precisely Naraku's principle of spiritual practice.

Despite his occasional visits to the Uchiha clan head's house, he has never slacked off in his training.

Now, let's talk about this.

Needless to say, the spiritual energy fed back by the True Qi Shadow Clone is also crucial, especially the True Essence Pill it ingests.

The True Essence Pill that Naraku consumed at this time was not the same as before; it was a high-grade True Essence Pill.

Just like people, even the same kind of elixir has different grades.

For example, the True Essence Pill refined a year ago was only of medium to low grade.

The True Essence Pills of today are different; each one is a top-grade True Essence Pill of the highest quality.

The improvement in the grade of the True Essence Pill is due to the quality of the spiritual herbs.

More than a year has passed.

With the help of the partially completed Heavenly Divine Water, Naraku has now cultivated a large number of spiritual herbs that are over a hundred years old.

The quality of the elixir.

Both a century and a millennium are significant milestones.

A hundred-year-old spiritual herb contains a spiritual essence that even ten ninety-year-old spiritual herbs combined cannot match.

Especially in alchemy.

Quantity alone cannot compensate for quality.

The quality of elixirs that can be refined from herbs of a certain year is determined by their age.

Let's return to spiritual practice.

In the past year or so of training, in addition to successfully completing the unification of the five elements in his supernatural powers, Naraku's cultivation level has also not lagged behind.

Especially the appearance of the superior-grade True Essence Pill.

A superior-grade True Essence Pill is far more effective at improving cultivation than a mid- to low-grade True Essence Pill.

In addition, Naraku never relaxed his self-training.

Today, he is already charging towards the pinnacle of Qi Refining.

One by one, the top-grade True Essence Pills were swallowed.

Using the nameless cultivation technique, Naraku quickly refined the True Essence Pills one by one.

Furthermore, this is combined with the spiritual energy fed back from the True Qi Shadow Clone from time to time.

After an unknown amount of time, the growth of his internal energy gradually stopped, and at the same time, a sense of perfection naturally arose from within him.

"I have finally completed my Qi cultivation."

The abnormality of his true energy and the strange sensation arising in his dantian startled Naraku from his meditation.

Investigate internally with divine sense.

When Naraku discovered that he had actually reached the perfection of the ninth level of Qi Refining, he was somewhat dazed for a moment.

He has actually reached the peak of Qi Refining?

"It's truly perfect! I've finally reached the pinnacle of the Qi Refining stage!!"

After a brief moment of disorientation, Naraku immediately became overjoyed.

He had been waiting for this moment for a long time.

With his Qi Refining stage at its peak, he is now only one step away from the Foundation Establishment stage.

It took Naraku quite a while to calm down his turbulent emotions.

"We can't rush it. Breakthroughs in the Foundation Establishment stage are not like those in the Qi Refining stage; we must make much more preparations!"

Naraku did not rush to break through to the Foundation Establishment stage, but instead calmly considered the situation.

Although there is only one step between the Qi Refining Perfection stage and the Foundation Establishment stage, this step is far more significant than any minor breakthrough during the Qi Refining stage.

According to the description of breaking through the Foundation Establishment stage in the "Immortal Dao Secret Manual", two conditions need to be met.

One is full of vitality and spirit, the other is full of spiritual energy.