Did high-level Wood Release require life force?

After successfully awakening his sage body, Uchiha Ensei could feel the ocular power of his Mangekyō Sharingan beginning to grow.

Could I awaken a Rinnegan of my own?

Although he had already confirmed that the Rinnegan and Mangekyō Sharingan were two different types of ocular jutsu, the Uchiha Clan were descendants of the Sage of Six Paths, after all. There was still a chance of awakening the Rinnegan.

Come to think of it, Naruto really did deserve to be called the legend of the eyes.

Although they all originated from Kaguya Otsutsuki, many different variants had emerged as her bloodline was passed down.

There were all sorts of classifications, such as the Sharingan, Byakugan, Red Eye, Ketsuryūgan, Tenseigan, and Rinnegan.

Beyond those, there were also eyes unique to the Ōtsutsuki Clan, such as the Jōgan and Black Eye.

All in all, it was a complete mess.

Even now, Uchiha Ensei could not be certain of the ultimate evolutionary path of his own eyes.

But he knew one thing for sure: even without the ocular power of over a hundred thousand Byakugan sealed within him, the strength of his current Mangekyō Sharingan was by no means inferior to the Eternal Mangekyo Sharingan.

After all, Uchiha Ensei had never felt any backlash from his eyes when using his ocular jutsu.

Not even the Eternal Mangekyo Sharingan had ever achieved that.

After watching the Ten-Tails Jinchuriki Clone absorb natural energy for a while, Uchiha Ensei formed hand seals and used the Wood Clone Technique.

To a certain extent, wood clones were much like shadow clones, except they could take more punishment and were stronger in combat.

In theory, with enough chakra, a wood clone could even possess combat strength close to that of the original.

After so many years of researching Hashirama cells,