If a member of the Uchiha clan could perfectly master the Hōgyoku mode and possessed extremely strong ocular power with a three-tomoe Sharingan, it might be possible to use Susano'o without unlocking the Mangekyō Sharingan.
Although, in the end, it would likely only be the first stage of Susano'o.
While this is just speculation, if the Uchiha clan were willing to experiment by sacrificing a pair of three-tomoe Sharingan, Kagetsu wanted to transplant the Hōgyoku to Shisui and see if his hypothesis was correct.
Of course, if the transplantation of the eyes proved to be a dead-end, another path could be explored—trying to restore the lost ocular power over time by supplementing it with other forms of power.
Although it was uncertain whether this approach could lead to the so-called Eternal Mangekyō, Kagetsu theorized that it was worth attempting.
The only downside was that this path might require a much longer time to bear results.
"Did any of your ancestors ever unlock the Mangekyō Sharingan?"
As Yahiko and Nagato left, Kagetsu suddenly asked Shisui, who was standing beside him.
"You're asking about Lord Kagami's eyes, aren't you?" Shisui replied.
Over the past few days, he had discussed the Sharingan with Kagetsu many times and was well aware of Kagetsu's theories about the Mangekyō.
He had even provided Kagetsu with a significant amount of secret information about the Uchiha clan's Sharingan.
Within the Uchiha clan, most of the forbidden techniques involving the Sharingan were collected and managed by the elders and the clan head.
However, except for a few techniques like Izanagi and Izanami, these forbidden techniques could be requested for study as long as a clan member had made significant contributions or reached a certain level of strength.
As a subordinate of Orochimaru, Shisui's status within the Uchiha clan had risen alongside the deepening alliance between the Uchiha and Orochimaru.
This rise in status didn't mean Shisui could rival the elders or some elite jōnin within the clan. Instead, it was more of an honorary recognition.
Many members of the Uchiha clan hoped that Shisui could act as a bridge, helping to establish stronger ties with Orochimaru and Kagetsu.
For example, Fugaku's son, Uchiha Itachi, was eagerly awaiting the day when Kagetsu would be promoted to Jonin and begin leading his own team.
This was something both sides had already agreed on tacitly. While Orochimaru did not openly express approval, his silence was essentially consent.
No one doubted that Kagetsu would achieve the rank of Jonin, especially during wartime. In every war, while many ninja were lost, new Jonin and Chunin would quickly rise to fill the gaps.
During wartime, the process of ninja promotion was much faster than during peacetime. With a shortage of manpower, the village could afford to support those promoted during wartime.
"I've heard of Uchiha Kagami. He served under the Second Hokage, alongside the Third Hokage, the Advisors, the Hokage's assistant, and Elder Torifu of the Akimichi clan. He was part of the Hokage Guard Platoon.
Torifu spoke highly of his strength, saying he mastered the Sharingan to an extraordinary level. Did he ever awaken the Mangekyo Sharingan?"
Kagetsu asked this question directly. He wasn't sure if Uchiha Kagami had ever unlocked the Mangekyo Sharingan, so he decided to ask Shisui, Kagami's direct descendant.
If Kagami had awakened it, then where was the Mangekyo Sharingan now?
"I don't know," Shisui replied, shaking his head, giving Kagetsu an unexpected answer.
"You don't know either?" Kagetsu sighed inwardly.
"He never showed me the power of Mangekyo. Although he liked teaching me in his free time, he was always very busy," Shisui said softly.
"Then how did he die, and what about his body and eyes?" Kagetsu asked curiously. It seemed like a secret that hadn't been mentioned before.
"At the Uchiha cemetery," Shisui answered openly. "In the cemetery near the village's memorial stone, there are also some of his clothes and belongings."
"As for the eyes, typically when a clan member dies, an elder is responsible for handling them."
After a pause, Shisui looked toward Kagetsu with his bandaged eye and explained, "Normally, regular Sharingan eyes are recovered and destroyed, but Sharingan with powerful abilities are preserved through special medical methods.
As far as I know, the clan has a secret room used to store the Sharingan of our ancestors. How many pairs of Sharingan are kept there, I'm not sure.
An elder specifically responsible for the eyes probably exists in the Hyuga clan too!
Though the branch family of the Hyuga might damage the Byakugan and seal its abilities, when a member of the main family dies, the fate of the Byakugan is a secret.
Like the Uchiha, there should be an elder in charge of handling and managing the eyes."
Kagetsu nodded in understanding. He didn't ask further questions.
In fact, he knew that Shisui had already revealed quite a few secrets about the clan.
If he pressed on, Shisui might not hide anything from him, but he knew that digging deeper into the clan's more profound secrets would be pointless.
"Now, what if we take your Mangekyo Sharingan and use it as material to create a set of ninja tools? Would you accept that?" Kagetsu suddenly asked, his idea coming to mind.
"Using the Mangekyo as material to make ninja tools?" Shisui struggled to follow Kagetsu's sudden leap in thought. Weren't they just discussing how to restore his vision? Why did they suddenly move to using his eyes to create ninja tools?
"Simply put, using your eyes as material to create a set of ninja tools with Mangekyou abilities." Kagetsu explained the idea forming in his mind.
"Is that even possible?" Shisui asked, incredulously.
To create ninja tools with the abilities of the Mangekyo Sharingan? Did that mean with this set of tools, one could activate Susanoo and use the Mangekyo techniques?
How could that be possible?
However, as Shisui thought about Kagetsu's past research achievements, his determination wavered for a moment, and he felt somewhat lost.
It seemed that Kagetsu's inventions and research always turned the impossible into the possible!
Especially when it came to the Kekkei Genkais of ninjas, Kagetsu had already successfully created ways to artificially produce them in his lab.
The Blaze Release in Anko was one such example!
Also, since even something as unbelievable as the Hogyoku had been created, it didn't seem entirely impossible to turn the Kekkei Genkais into a set of ninja tools.
"Why is it impossible?" Kagetsu said, his eyes shining. "The difficulty isn't great. It just requires some preparation and materials.
We also need to find a test subject to see if the ocular power can be restored. If this plan works, your Mangekyō Sharingan might become a different form of the Eternal Mangekyō Sharingan."
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