This was the scene from back then when Kaguya Otsutsuki was sealed. It seemed that Kaguya Otsutsuki had been sealed inside the body of the Ten-Tails. Once someone became the Ten-Tails' Jinchūriki, they also ran the risk of being possessed by Kaguya Otsutsuki.
Uchiha Kyu's mind cleared considerably in an instant. Looking at Kaguya Otsutsuki in the scene, he found the young mother's adorably clueless air quite endearing. What a pity that she had encountered two unfilial sons.
However, Kaguya Otsutsuki seemed to have used chakra far too one-sidedly, falling well short of the two brothers, Hagoromo Otsutsuki and Hamura Otsutsuki. No wonder she had been sealed. She was pitifully foolish.
These fragments were viewed from the perspective of the Divine Tree—in other words, the third-party perspective of the Ten-Tails—as it watched this battle that would alter the world's balance for a thousand years.
Uchiha Kyu's will gradually devoured the Ten-Tails' will, completely securing control of the dominant consciousness. The Mangekyō Sharingan in his eyes glowed with a cold, crimson light.
His forehead seemed to split open as an eye grew out of it, flesh and blood.
A white robe adorned with the tomoe of the Six Paths gradually replaced his original clothes. The Six Paths Staff formed from a black orb, and Uchiha Kyu gripped it in one hand.
Before Uchiha Kyu could even feel the power of Six Paths Mode, the Mangekyō Sharingan suddenly throbbed as if pierced by needles. The pain lasted only a second, like a hallucination.
Uchiha Kyu immediately checked the Cultivation Template.
[Nine-Tomoe Sharingan: 100%] [Rinnegan: 100%]
Two more abilities had appeared among his original powers. One was the Nine-Tomoe Sharingan on his forehead, which was also the eye of the Ten-Tails.
As for the Rinnegan, it had been born with him.