Among all the Mangekyō Sharingan that Mizuki knew of, the only example of someone who could escape the loss of vision or even blindness after frequent use was Uchiha Obito.
The Mangekyō Sharingan, which does not achieve eternity, cannot be considered the ultimate form of the Sharingan. However, in terms of power, there is actually no essential difference between the two. There is only a quantitative difference in the proficiency in use and the strength of the pupil power.
The perfect Susanoo performed by the Eternal Mangekyō Sharingan is not necessarily much stronger than the Mangekyō Sharingan.
However, the consumption of pupil power is always a problem that cannot be avoided.
Mizuki didn't fully understand what pupil power was, but it was definitely there. After examining the Mangekyō Sharingan, one could understand the existence of this thing.
The blood relatives had transplanted the power of the Mangekyō Sharingan and upgraded it to the Eternal Mangekyō Sharingan. But no one could tell how to restore it to its original appearance. Uchiha Madara only accidentally received the Mangekyō Sharingan from his younger brother Uchiha Izuna and discovered the secret of the fusion of eye power by accident.
This simple transplant operation naturally poses no difficulty for Shuimu.
"I don't know what you were thinking, but Shimura Danzo was killed just like that. You are really amazing!"
The annoying guy was dead, and Mizuki was in a good mood. He rarely complimented Uchiha Sasuke.
"That old man is out of date and should have died long ago."
Uchiha Sasuke showed a smug smile at the corner of his mouth:
"Hatred can bring strength to people, especially to Uchiha."
Sasuke, who still believes that he has avenged himself, doesn't think there is anything wrong with him.
"There's only one left!"
"Really? Then go for it!"
Mizuki has tried to kill Uchiha Obito several times, but has never succeeded. This has only made this brain-damaged paranoid stronger.
If possible, Mizuki really didn't want to be directly involved with these guys who ultimately decided his fate. Maybe by then, he would have to face Uchiha Madara or even Otsutsuki Kaguya himself.
He is neither the reincarnation of Asura and Indra, nor the legendary child of destiny. It is better to let the protagonist fight wits and courage with the mastermind behind the scenes.
Uchiha Sasuke stared with his eyes blurred with limited vision, thought for a moment and then said:
"Can the fusion of the Mangekyō Sharingan's eye power that Itachi mentioned really make the Mangekyō Sharingan even better?"
“That’s about right!”
Mizuki confirmed Sasuke's question.
"Then can the unique eye techniques of the Mangekyō Sharingan also be integrated and inherited?"
"It shouldn't be possible. Unless special means are used, it is basically impossible for another person to obtain the same power as this unique pupil technique."
"Then why would I use Amaterasu?"
“Is it strange?”
Mizuki shrugged.
"I don't know the specific reason. I need to check it out to find out."
Even if a ready-made research object cannot be dissected, you should find an opportunity to learn more about it. Otherwise, you will have a lot of questions that you want to verify, but you won’t even be able to find an experimental subject.
After hesitating for a long time, Uchiha Sasuke finally agreed with Mizuki's suggestion reluctantly and decided to be a guinea pig for once, so that he could also figure out his own strengths and weaknesses and become stronger next time.
Since the parties involved didn't care, Mizuki naturally took this opportunity to study Uchiha Sasuke's Mangekyō Sharingan carefully.
After a long time, Shuimu had some preliminary results and took off the plastic gloves on his hands.
"How about it, have you come to a conclusion?"
“That’s about right!”
Mizuki looked at Sasuke who looked somewhat hopeful.
"The pupil power of both eyes is greatly consumed, which is very troublesome..."
The problem is not just that big.
The harm caused by consuming a large amount of the Mangekyō Sharingan's power in a short period of time is more serious than imagined.
It's like running for exercise.
A beginner who insists on running 3,000 meters every day will only run more than 500,000 meters in half a year. Although it is difficult to persist, as long as you exercise properly, there will basically be no problem.
But for a novice, if he runs 500,000 meters in one day, his muscles might dissolve, and he would be lucky if he didn't lose his life.
Although I don’t know what kind of magical talents the so-called reincarnation of Indra’s chakra has, but if this continues, no matter how talented he is, it will not be enough.
"Tell me the question you asked first!"
Mizuki pointed at Uchiha Sasuke's left eye.
"As you expected, the Amaterasu ability in your left eye is not something you have naturally. I think Uchiha Itachi must have used some method to place the Amaterasu ability in your left eye."
"Boarding?"
Uchiha Sasuke was a little confused about the use of this word here.
"You can understand that Uchiha Itachi had already given you part of his eye power, along with Amaterasu's ability, in some way before his death."
Mizuki had some doubts before. In the original work, even though Uchiha Sasuke transplanted the power of Uchiha Itachi's Mangekyō Sharingan, he still did not inherit the ability of Tsukuyomi, but Amaterasu used it with ease.
If transplanting eye power would allow one to receive the unique eye techniques of another pair of Mangekyō Sharingan, it would make no sense that one would selectively inherit only Amaterasu and ignore the very practical Tsukuyomi.
"That is, I am just using the legacy Itachi left for me specifically! Why is it Amaterasu?"
Shuimu smiled:
"Each pair of Mangekyō Sharingan has a different unique eye technique. The left and right eyes of the same pair of Sharingan are different when they are born."
This is indeed true. The eye techniques of Uchiha Obito's left and right eyes are both Kamui, but the emphasis of their usage is completely different. Uchiha Itachi's left and right eyes are Tsukuyomi and Amaterasu respectively. It is very likely that the strongest illusion techniques of Uchiha Shisui's left and right eyes, Besuamatsukami, are somewhat different.
Of course, the last point still needs to be verified by Shuimu.
"My right eye should be the Kagutsuchi who controls fire, so what's up with my left eye?"
"It's just a coincidence!"
Shuimu said helplessly.
"Each Mangekyō Sharingan corresponds to a dojutsu, which should be correct. However, it may not be so obvious. The dojutsu of your left eye should correspond to one of your strong wishes, or an extremely powerful specialty!"
It is reasonable that Uchiha Sasuke's right eye restrains Uchiha Itachi's eye technique Kagutsuchi. This is Uchiha Sasuke's wish in his heart. What about that day? Even in the original work, Uchiha Sasuke's fire escape technique is not outstanding, but his lightning escape technique is much stronger.
Especially now, how could Uchiha Sasuke, who specializes in Lightning Release, awaken the ability of Amaterasu?
Therefore, it can be basically confirmed that the Mangekyō Sharingan Technique in Uchiha Sasuke's left eye - Amaterasu, was the work of Uchiha Itachi.