After ordering a Ninja Cat to send Fugaku Uchiha a message confirming he was safe, Ensei Uchiha decided to conduct his experiment to increase his strength in the ruins of the Empty Zone.
At this point in time, aside from the Otsutsuki Clan, who he might run into, Nagato was probably the strongest enemy Ensei Uchiha could face.
With his legs still unrecovered, Nagato wouldn't pose too great a threat to him if he relied solely on the Six Paths of Pain.
But by now, Nagato's body should have been infused with White Zetsu cells, and there was a good chance that Kotoamatsukami had altered his thoughts.
More importantly, the Rinnegan was the perfect counter to Ensei Uchiha's straightforward fighting style of overwhelming his opponents with sheer ocular power.
If he hadn't learned Flying Thunder God in advance, he would probably have had to resort to some trump cards, such as Izanagi, his own Sage Mode with all its risks, or any number of other costly forbidden techniques.
One could imagine just how dangerous a technique had to be for someone like Ensei Uchiha to classify it as forbidden.
"I've decided. I need to find a way to awaken my own Mangekyō Sharingan. It's the simplest and safest way to increase my strength."
"With the Mangekyō Sharingan, I can finally unleash Susanoo's true power. It won't be absorbed so easily by the Preta Path."
From among his many experimental plans, Ensei Uchiha selected the one he considered simplest and began preparing to carry it out.
But before conducting the experiment to awaken his Mangekyō Sharingan by force, Ensei Uchiha still had plenty of preparations to make.
For example, he needed to create a Hashirama cell culture medium for a cloned Single Tomoe Sharingan, so it could develop into a Three-Tomoe Sharingan as quickly as possible.
After all, the Uchiha Clan's stock of Three-Tomoe Sharingan that he had obtained from Fugaku Uchiha was nearly depleted.
Though he disliked this slow cultivation method, Ensei Uchiha still had to prepare. He didn't want to find himself without a Three-Tomoe Sharingan when he needed one.
As a member of the Uchiha Clan, his own eyes were the most useful. Ensei Uchiha wouldn't give them up unless absolutely necessary.
He also had to conduct cloning experiments on God Tree cells.
During the earlier skirmish, Ensei Uchiha had spent most of his time running, but that didn't mean he had done nothing.
Before leaving, he had used the space-shifting power of Flying Thunder God and, after numerous attempts, managed to cut off a tiny piece of the Demonic Statue of the Outer Path.
The piece was only about the size of a baby's fist, insignificant next to the Demonic Statue of the Outer Path.
But it was, after all, part of the God Tree, so Ensei Uchiha planned to try cultivating it.
He didn't expect much from the results.
The God Tree was practically the foundation of the Otsutsuki Clan.
With his current level of expertise, Ensei Uchiha had no chance of discovering anything useful.
It was a long-term goal.
Once he had completed these two preparations, the experiment to awaken his Mangekyō Sharingan was ready to begin in earnest.
Unlike Itachi Uchiha, Ensei Uchiha had nothing precious to him, no tragic past, and no Kotoamatsukami to help him.
Therefore, if he wanted any chance of awakening the Mangekyō Sharingan, he had to find another way.
First, he had to choose an extreme emotion. Ensei Uchiha decided to use anger as the catalyst for awakening his Mangekyō Sharingan.
Next, he needed a specially modified White Zetsu infused with Hashirama cells.
White Zetsu cells were similar to Hashirama cells, but the two were fundamentally different. Hashirama cells had far greater vitality, so much so that they became highly aggressive and could easily spiral out of control.
White Zetsu, on the other hand, was a gentle, almost lifeless being.
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But if Hashirama cells' vitality was infused into that gentleness, White Zetsu could unleash tremendous power.
As a biological weapon, White Zetsu was a great success, but it needed a powerful energy source.
Ensei Uchiha had reason to suspect that Hashirama Senju's Wood Release might have come from the God Tree, and perhaps Black Zetsu had even created it himself to give Madara Uchiha the Rinnegan.
Of course, he had no evidence for this theory.
But none of that mattered. What mattered was the White Zetsu Cloak Ensei Uchiha had created, infused with Hashirama cells.
It could give Ensei Uchiha a level of regenerative ability rivaling Hashirama Senju's, at least for a short time.
Ensei Uchiha clearly remembered that when the Sage of Six Paths awakened his Sharingan, it evolved straight into the Rinnegan, while his son Indra awakened the Eternal Mangekyo directly.
All things considered, if he could gain regenerative abilities similar to a Sage Body, the difficulty of awakening his Mangekyō Sharingan would surely be reduced.
Finally, Ensei Uchiha took out the tiny amount of special Chakra he had once extracted from Itachi Uchiha's brain. Using the Transcription Seal, he sealed some of it inside each of his Sharingan.
"The odds of success still don't seem very high..."
After thinking it over for a long while, Ensei Uchiha took out a Three Tomoe Sharingan and performed a quick operation on his palm. Then he used the Transcription Seal to seal Izanagi inside the eye in his palm.
If the experiment failed, then so be it. His life absolutely couldn't be put at risk.
With this backup plan, he could recover from any mishap during the experiment.
Next, Ensei Uchiha unhesitatingly injected the Rage Potion into his body, followed by the drug that would paralyze him...
Losing control was inevitable when he was consumed by extreme anger, so he had to take measures to restrict his own body.
Then, with only a little time left before the drugs took effect, Ensei Uchiha put on the White Zetsu Cloak infused with Hashirama cells.
Immediately, he felt an immense vitality flow into his body.
Time passed second by second. The paralyzing drug Ensei Uchiha had injected had taken effect, and he had already lost control of his body.
But the Rage Potion still hadn't taken effect.
Just as Ensei Uchiha thought his experiment had failed, an overwhelming anger welled up in his heart from nowhere.
At the same time, the special Chakra sealed inside Ensei Uchiha's eyes began to flow into them...
Unfortunately, at that moment, Ensei Uchiha's mind held nothing but anger.
If he hadn't already lost control of his body, he would probably have unleashed his long-hoarded trump cards one after another.
Three months later, Ensei Uchiha emerged from the Laboratory, his face pale. His eyes still held a complex mix of joy and uncertainty.
"Ensei? Did your experiment succeed?"
Chachamaru, who had been waiting outside for three months, asked with concern.
But Ensei Uchiha knew Chachamaru wasn't truly worried about his safety. He just wanted Ensei Uchiha to help conduct Senjutsu Chakra experiments on a few more female cats from the Ninja Cat Clan.
Ensei Uchiha naturally had no objections, but Granny Cat knew that his research into Natural Energy was still lacking.
As a result, Chachamaru was the only one in the entire Ninja Cat Clan who could use Senjutsu Chakra.
"No. The experiment to awaken the Mangekyō Sharingan failed. But I happened to discover something even better..."
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