Black Zetsu had never actually seen the Tenseigan, but his memories contained information about it.
After all, he was a being formed by fusing and separating chakra from Kaguya-hime's body, specifically to deal with Hagoromo Otsutsuki and Hamura Otsutsuki.
His strength was certainly lacking, but his memory and intelligence were far from poor. Otherwise, he could never have schemed against so many people.
Judging by that brat Nagato's description, he felt that the so-called "Eye Radiating a Brilliant Azure Glow" really did seem to be the Tenseigan!
And the brat had said that the chakra could cover his body. Wasn't that one of the Tenseigan's signature abilities-Tenseigan Chakra Mode?
But hadn't the Tenseigan come from a mutation in Hamura Otsutsuki? How could this brat possess such power?
No matter how talented he was or how drastically his body had mutated, with so many years separating their bloodlines, he shouldn't have awakened something like the Tenseigan.
Could eyes called the Jōgan really exist? Or does that Senju Natsuhiko have some hidden connection to the Hyuga?
The Tenseigan belonged to Hamura Otsutsuki, whose direct descendants were the Hyuga. Under normal circumstances, they should have been the ones most likely to obtain it.
But ever since those people had descended from the moon, they seemed to have lost their own abilities, performing worse and worse.
His mother's taijutsu had grown steadily weaker in them, constantly wearing away. Even his mother's bloodline within them had become exceptionally thin.
He even knew that what should originally have been part of his mother's bloodline power, or rather, part of Hamura Otsutsuki's power-
Had actually been lost by the Hyuga, or perhaps separated from them. Those people were the Kaguya Clan, who had effectively been exterminated in Kirigakure. They had possessed Shikotsumyaku!
*Forget it. I won't bother