In Uchiha Gen's understanding and inference, Mangekyō Sharingan is actually just a defective product that was born under forced ripening under insufficient conditions.
Only defective products need another pair of Mangekyō to complement the original and complete the qualitative change of the Eternal Eye.
Of course, there are also issues related to the purity of the blood...etc.
But these are not problems in Xuan's view.
With his comprehension, sooner or later he will comprehend the method of purifying the blood.
In fact, he already has a lot of ideas about this, and has collected data and information that are not critical.
Most of them were still collected by him when he was still a fetus.
After all, at that time, the growth of blood in his body was the best data.
What is lacking now is the most critical personal data of self-awakening Sharingan.
As long as this ring is completed, the way to purify the blood is not a problem.
"Uh... Eternal Mangekyō? What is this?"
Uchiha asked with a puzzled look on his face.
"Eh?"
Xuan was slightly taken aback when he heard this, and asked in surprise, "You don't know?"
"totally no idea!"
Uchiha Chiichi shook her head.
Uchiha Maxim and Uchiha Hao on the side also nodded in unison.
Let alone Mikoto.
"I thought at least Dad, you should know!"
Xuan shook his head, and then asked: "Uchiha Madara, you all should know, right? Then, do you know that his Mangekyō was blinded and then regained his sight?"
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This time, both Uchiha Qianyi and Meixin nodded in unison: "We have heard of this, and there are related records in some of the clan's classics."
"Could it be that his Mangekyō Sharingan advanced to Eternal Mangekyō Sharingan after he regained his light?"
"How did he do it?"
The two of them knew why Uchiha Madara became so unique and strong in the first place.
It turns out that what he later owned was not an ordinary Mangekyō!
They didn't doubt why Xuan would know this.
From their point of view, it is estimated that Xuan found the key information by reading many medical books and gymnastics books in the clan.
Then, the truth deduced by his over-smart mind?
"That's right!"
Xuan nodded affirmatively: "It is true that he regained his light by advancing the Sharingan to the Eternal Eye!"
"As for how?"
"Naturally, he did it by fusing his brother Uchiha Izuna's Mangekyō Sharingan origin."
"What?"
Uchiha Qian and four people were shocked when they heard this.
Uchiha Qianyi was even more astonished and said: "How is it possible? He would do this? I remember your grandfather told me that Madara and his younger brother have a very good relationship. Why did he..."
Xuan understood what he wanted to say, and shook his head directly: "It wasn't Madara who took it! It seems that Uchiha Izuna was dying, and he gave his Sharingan to his brother;"
"Afterwards, Uchiha Madara fused two pairs of Mangekyō Sharingan to complete the Eternal Eye advancement."
"But even such an advancement, in my opinion, is still not perfect, and it is far better than relying on one's own step-by-step advancement."
Not to mention that this method requires relatives, preferably a brother's Mangekyō Sharingan.
"Um!"
Uchiha Qianyi nodded solemnly: "It's really not perfect! Besides, this method is too cruel! It must not be leaked, do you hear me?"
As he said that, he glanced at everyone present and warned: "Otherwise, it will not be good news for the Uchiha clan internally or externally."
The Uchiha family knew about it, but they didn't know what hidden dangers would be buried.
If some lunatic pursues power crazily and takes the initiative to promote this kind of eternal eye advancement, it will definitely be a disaster for the Uchiha clan.
And letting people outside the Uchiha clan know about it will not only make those who covet the Sharingan even more coveted.
At the same time, it will make some people think that the Uchiha clan is really inherently evil.
After all, taking away the eyes of one's own brother to complete the advancement of the eyes is an extremely evil setting no matter how you look at it.
"Uh-huh!"
Mikoto, Uchiha Maxim and Uchiha all nodded in unison, understanding the seriousness of the matter.
Not to mention Xuan.
He's a fool to talk nonsense.
"Xuan! Try to figure out the perfect way to advance to Eternal Eye as soon as possible! Our family depends on you! Dad, I am not in a hurry to advance to Mangekyō Sharingan!"
"I would rather not have this flawed advanced method."
Uchiha Chiichi exhorted Xuan with a serious face.
What's more, the method of forcibly stimulating the advancement is itself very cruel. You need to witness the death of your close relatives and friends, and you can complete the advancement in extreme despair and sadness.
He didn't want to lose his dearest and dearest friends.
"Yeah! Everything depends on you, brother!"
Uchiha Hao also followed suit.
You can't poach the eyes of your younger brother or father to advance to eternal eyes in the future, right?
Not to mention that he can't do it, if he dares to have such an idea, his parents will probably break his leg.
Even, when that day really came, he felt that with his brother's monstrous talent, he must have been unable to beat his brother long ago.
"Don't worry, leave it to me! I won't let you wait too long!"
Xuan nodded confidently.
Seeing him like this, everyone breathed a sigh of relief.
.....
one month later,
[You have read a lot of medical books and physical secret techniques, and have mastered them thoroughly. Your medical skills have been greatly improved, and you have been promoted to the expert level. ]
.....
after three months,
[You have realized the process of strengthening body cells and passively replenishing cell energy and vitality through the process of congenital kung fu practice, and you have created an inverse-innate kung fu. ]
[Inverse·Congenital Skills]: Guided by characteristic operation, reverse the congenital energy, consume the congenital energy to replenish the energy and vitality that cells lack.
"It's done! With this, I finally don't have to worry about damaging the cells and losing my own vitality due to extracting Chakra in the future."
Xuan digested the newly created exercises in his mind, the corners of his mouth slightly curled up, and a smile appeared.
As for the need to consume innate weather for this inverse innate skill?
This is not a problem, not to mention that he has accumulated a lot of innate energy through practicing innate skills over the years.
The practice of this innate skill is actually similar to the internal energy in the world of martial arts. Unless there is an accident, simply consuming part of the innate energy will not cause the cultivation base of the innate skill to regress.
Part of the innate energy consumed can also be quickly recovered by running the innate energy.
Therefore, it is completely possible to replenish the cells that are depleted when extracting Chakra in advance.
This is a more perfect cycle.
Of course, in the future, Xuan still wants to create exercises that are compatible with Xiantian and Chakra practice.
Moreover, this kind of practice must be able to accumulate Chakra and congenital Qi by absorbing external energy, without extracting energy from cells and consuming mental power to synthesize it.
That is the truly perfect practice method in his mind.