Once entering the second stage, Tsubasa and Maru completely transformed from theoretical concepts into practical techniques. It's worth noting that only after completing the first stage of Beast training can one begin learning this technique. However, its early stages offer little power or effectiveness—it's only viable in theory, not in practice.
As one progresses through the first stage, the speed of Tsubasa and the destructive force of Maru will also increase accordingly.
When Shiyu Uchiha personally experienced the astonishing effects of Yang Release fusing with Fire Release, a profound realization struck him. No wonder some members of the Uchiha clan had long coveted this mysterious art, just like Renga Uchiha's father once did.
However, reality was harsh—those possessing the Yang nature among the Uchiha were extremely rare. Even worse, the entire Uchiha clan's proficiency in Yang Release was severely lacking. Even when someone did possess Yang chakra, their aptitude for it was mostly mediocre at best. As a result, the development of related secret techniques within the Uchiha had stagnated at a primitive and crude theoretical stage.
That's why, before Shiyu Uchiha appeared, no one had ever truly mastered or successfully used this secret jutsu.
Such magical effects undeniably held tremendous appeal and potential benefits for Shiyu. Through constant training, he could steadily enhance his physical constitution, making it tougher and more resilient;
Simultaneously, his chakra reserves would steadily grow, becoming as abundant and continuous as a flowing spring. Most notably, the destructive power of his signature Fire Release ninjutsu would experience a substantial boost—as fierce and intense as burning flames. Even standard techniques like the Great Fireball would see greatly increased potency.
Nonetheless, every coin has two sides. As Shiyu continued advancing in this secret art, he encountered an unavoidable issue:
Because the jutsu continuously enhanced and altered his constitution, performing other elemental ninjutsu through Chakra Nature Transformation became increasingly difficult. Not only did he need more control, but his chakra consumption also increased significantly.
Even more frustrating was that instead of improving, the destructive power of those other techniques actually diminished despite greater investment of effort and energy. In short, just as fire techniques gained tremendous enhancement from the fusion of Yang and Fire Releases, other elemental techniques suffered losses of equal magnitude.
Therefore, even those forms of Chakra Nature Transformation Shiyu had previously mastered now proved far more difficult to execute, with results that could only be described as yielding little despite great effort. And as the physical enhancements from the secret jutsu continued progressing, these difficulties were destined to worsen significantly.
To Shiyu, trying to expand into new chakra natures through Chakra Nature Transformation now seemed nearly impossible—an exhausting and fruitless struggle.
Perhaps this could explain why, aside from forbidden techniques, Tobirama Senju never demonstrated any of The Five Natures beyond Water Release, yet still wielded such immense power.
However, the most crucial point was that right now, [Eye Technique (Dojutsu)] could further amplify Fire Release Ninjutsu.
Under these circumstances, Shiyu Uchiha once again gained profound insight into entirely new ways to wield the Mangekyo Sharingan. Moreover, he had now even learned to effectively control the consumption of Dōkuriki.
At the same time, he noticed that by using Yang Release to fortify his physical body, the side effects from using the Mangekyo Sharingan had been significantly reduced. Of course, for now, this only worked with the most basic Dojutsu applications.
The current situation was this: if activating a single instance of Dojutsu drained one point of Dōkuriki, then when using both Mangekyou eyes together to perform a technique, each eye only needed to exert one-fifth of its usual power to reach the same level of effect as a single eye at full strength.
Furthermore, the most critical factor was that under these conditions, if he used Mangekyo Dojutsu only once within a short period, it would barely cause any negative impact on his pair of incredibly precious eyes.
Additionally, after careful sensing and bold speculation, he believed that even if he repeatedly used this powerful Mangekyo Dojutsu within a brief timeframe, as long as the number of uses didn't exceed five, the resulting negative effects should not be excessively severe.
Nonetheless, even though he held such a seemingly reasonable hypothesis in mind, he absolutely wouldn't recklessly test whether this conclusion was correct.
Moreover, if the Dōkuriki in each eye was controlled to about one-third of its capacity, the power of Mangekyo Dojutsu could instantly double!
To his satisfaction, even when operated this way, as long as he continued limiting himself to a single use within a short period, it still wouldn't bring excessive damage to his fragile eyes, nor disrupt the miraculous state of the Mangekyo Sharingan.
However, once he fully committed both eyes—activating both Mangekyo Sharingan at their absolute maximum or even pushing them beyond limits to enhance a Fire Release Ninjutsu—the power of Fire Release would inevitably undergo an unimaginable qualitative leap.
But without doubt, the toll this approach would take on the Mangekyo Sharingan would also be extremely heavy and nearly impossible to estimate.
Currently, Shiyu had only considered this method multiple times in his mind but hadn't actually used it yet. He remained extremely cautious—because he knew all too well that taking such a risk might ruin his eyes after just one or two uses, eyes he valued as dearly as his very life. The consequences would be catastrophic—beyond anything he could imagine!
Yet, at the same time, he suspected—if he never fully committed even once, he might never unlock the deeper Ultimate Art of his Mangekyo Sharingan or achieve his goal of completely eliminating the side effects of the Sharingan. This had left him quite hesitant recently.
This transformation wasn't mentioned in the original canon. The reason behind it was something Shiyu Uchiha only started to glimpse a potential way to achieve after his mother's inspiration led him into deeper research. Currently, it can barely be realized only when the [dojutsu] in both eyes are extremely similar. Even then, this is still just the foundation—there are many more complex aspects involved later on, including knowledge related to [Yin Release], [Yang Release], and [Yin-Yang Release].
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