After sealing the Ten-Tails in his own Alternate Dimension, Meihui returned to Konoha.
Once Meihui found Sasuke, he explained what had happened and told him he had found a way to evolve his Rinnegan.
Sasuke asked uncertainly, "Are you sure you really know how?"
Sasuke still did not quite trust the guy. Sure enough, Meihui visibly hesitated when confirming it. After knowing him for so many years, they could tell at a glance that even Meihui was not entirely sure it would work.
But before Uchiha Sasuke could say anything else, Meihui grabbed him and shoved him into the Alternate Dimension from earlier.
"Come on, Uchiha Sasuke. Watch me evolve your Rinnegan today."
Sasuke's mouth twitched at those words. He had a feeling something bad might happen soon.
The Byakugan, Sharingan, and Rinnegan were known as the three great ocular techniques in Naruto. Among them, only the Rinnegan possessed the supreme ocular power known as the "eyes that controlled life and death."
It was the ultimate ocular technique, originating from the God Tree's Chakra Fruit.
Those who possessed the Rinnegan could automatically master all five chakra nature transformations, as well as control yin and yang, and generally possessed extraordinary abilities. (Nagato Uzumaki, for example, had received transplanted Rinnegan. Although they left him sickly, there was no denying how powerful he was.)
Likewise, this ocular technique was also the most dangerous. Its wielder was a double-edged sword: he could be a god of creation capable of bringing a world into existence, or a god of destruction capable of annihilating it.
The Rinnegan passed down from Ōtsutsuki Kaguya were generally purple. The Sage of Six Paths, Hagoromo Otsutsuki, had purple Rinnegan, as did Madara Uchiha. Even Sasuke's Rinnegan was purple.
After absorbing Kaguya, Meihui had also possessed purple Rinnegan. But after he