The higher the similarity between dojutsu, the greater the benefits gained. Theoretically, if this similarity reached its peak and one used their Mangekyo sparingly, even complete depletion of dōkuriki would not necessarily lead to blindness.
Of course, since no one's ever put this to the test, it's still just an unproven theory for now. After all, once dōkuriki runs dry, the bloodline power dries up too, inevitably affecting the eyes themselves. Even without total blindness, vision loss would likely be nearly the same.
In short, this is just a perfect scenario imagined in theory. At best, it might simply let users keep their dojutsu abilities a bit longer than most.
At the same time, the Uchiha Clan had always firmly upheld the traditional practice of preserving fully developed Sharingan, precisely to prevent blindness caused by excessive consumption of dōkuriki after awakening the Mangekyō Sharingan.
This allowed clan members, when necessary, to swap in a compatible pair of fully developed Sharingan eyes and use their associated secret jutsu. Though this method might reduce their power a little, they'd still be able to support the clan and avoid extreme consequences.
Turning back to Shiyu Uchiha, by comparing Yin Release and Yang Release separately combined with Fire Release, the research value contained within—even without considering practical applications—exceeded his wildest expectations!
Driven by curiosity and a desire to explore, Shiyu cross-referenced and analyzed both forms, quickly gaining deeper insight into the true nature of Fire Release—as if he'd suddenly seen the light.
When he applied these deep insights to the fire release techniques he had perfected, his jutsu underwent a qualitative transformation—especially his signature move, the Blazing Meteor, which evolved in a truly revolutionary way.
Already a formidable technique, the Blazing Meteor became even more powerful, receiving unprecedented enhancements, bearing hints of the Tailed Beast Ball's power.
After running multiple tests, Shiyu judged that his fire release techniques now carried enough punch to threaten even the Tailed Beast Chakra Cloak head-on.
If his fire release attacks landed several hits in a row, even a powerful Jinchuriki wrapped in a Tailed Beast Chakra Cloak would have trouble surviving the onslaught unscathed.
As his comprehension of Fire Release deepened further, Shiyu clearly felt himself approaching a new threshold in mastering its ultimate techniques. Once broken through, there would be hope of reaching yet another level entirely.
Shiyu believed that once he broke through again, he might just be able to revive Hashirama Senju's myth in the ninja world, the only difference being that one wielded Wood Release, while the other commanded Fire Release. During this period, by comparing the varying degrees of enhancement provided by these two distinct types of Fire Release, he finally arrived at an important discovery: The issue seemed rooted in his bloodline itself.
Whether Yin Release or Yang Release combined with Fire Release, both could effectively enhance the power of Fire Release techniques. However, due to possessing the pure bloodline of the Uchiha Clan, Yin Release gained additional bloodline reinforcement when merged with Fire Release, which further gave rise to stronger Dōkuriki.
That's why the power boost from combining Yin Release and Fire Release was noticeably stronger.
Just as Wood Release is born from the perfect fusion of earth and water elements, in the hands of the legendary Hashirama Senju, it became an unparalleled force that inspired fear across the land!
Shiyu Uchiha had gone deep into his past-life memories and studied current theory. Based on that, he believed that the reason Hashirama Senju's Wood Release was so powerful was that, unlike ordinary Kekkei Genkai, when Hashirama developed the Wood Release, his bloodline ability fed back into himself, further activating his supreme Yang Release, which became integrated into his Wood Release.
This fusion turned Wood Release into the perfect vessel for unleashing ultimate Yang Release, enabling it to surpass even the strength of the Eternal Mangekyou. This also explains why successive reincarnations of Asura—including Asura himself—needed external allies to defeat Indra, and why even Madara Uchiha, working alongside the Nine-Tails, ultimately failed.
Moreover, even the seemingly living and highly maneuverable nature of Wood Release was actually a concrete manifestation of Yang Release shaping life itself.
Thus, it becomes clear that the true strength did not lie within Wood Release itself, but rather in the supreme Yang Release power controlled by Hashirama Senju. Of course, this doesn't mean Wood Release held no value at all—it was still an indispensable piece of the puzzle. After all, all the Six Paths' powers originated from the God Tree—each representing a fundamental force of nature. Interestingly, Shiyu Uchiha's current situation bore a similar underlying mechanism.
The pair of eyes possessing the third tomoe, glowing mysteriously, contained the long-standing bloodline power of the Uchiha Clan. Precisely because of this, when he combined the power of his third-tomoe Sharingan with Fire Release, he could unleash chakra of extraordinary power. However, he was merely a descendant of Indra, not a reincarnation of Indra, and in certain aspects, he still had a long way to go. Therefore, the effect wasn't nearly as striking as what Hashirama Senju had achieved.
Nevertheless, what Shiyu Uchiha had accomplished up to now was just the fusion of the ordinary third tomoe Sharingan with Fire Release. If, one day, he successfully integrated even stronger Mangekyou Sharingan power into Fire Release as well, the resulting destructive force would reach an unimaginable level.
Yet, by that time, traditional Fire Release techniques alone would likely no longer be sufficient to fully unleash such terrifying power. Perhaps only some special Kekkei Genkai could allow Yin Release powered by the Mangekyou to manifest its full potential!
For Shiyu Uchiha, using the Mangekyou Sharingan this way was ideal. It didn't just unleash massive power—it also used surprisingly little energy, allowing extended use with just a pair of Mangekyou eyes. Moreover, the bloodline ability itself should also be capable of nourishing the Sharingan in return, offering tremendous benefits to himself.
Yet, the difficulty of merging Mangekyou power with Fire Release was unexpectedly immense.
Meanwhile, during this time, his control over [Susanoo]—the third major ability of the Mangekyou—had already reached an exceptionally high level, attaining the peak of ordinary Mangekyou users. Although Susanoo possessed overwhelming strength, to Shiyu Uchiha, it was ultimately a waste of resources.
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