Setting aside Shiyu Uchiha's inner unease, after a brief emotional release, he quickly regained his composure and began to contemplate this dōjutsu to gain benefits and strengthen his power.
The first step in this contemplation naturally involved activating the dōjutsu itself; otherwise, there would be nothing to contemplate. Since both eyes possessed the exact same dōjutsu, it left the momentarily hesitant Shiyu Uchiha facing a minor decision—he began to wonder which dōjutsu he should activate.
Shiyu Uchiha pondered back and forth, eventually falling into deep thought. Soon, he realized how ridiculous his behavior was. Instinctively, he raised his right hand to stroke his chin before deciding to test the dōjutsu in his left eye first.
When Shiyu Uchiha successfully activated the dōjutsu in his left eye, he clearly felt subtle changes occurring within his chakra under its influence—similar to the Mystic · Fire Release · Chakra Mode. This transformation gave him an overwhelming sense of immense power, one so intoxicating that he felt an intense pull toward it.
Without delay, Shiyu Uchiha hurried to his personal training ground. First, he pushed his sensor ability to its limits before beginning to release Fire Release ninjutsu. He started with the most basic technique—the Great Fireball—and instead of simplifying the hand seals, he performed them strictly according to the standard mode.
As he unleashed each Fire Release ninjutsu, Shiyu carefully observed its nuances and hidden mysteries. To his delight, he discovered that when the Mangekyo Sharingan activated alongside these ninjutsu, it consumed a tiny bit of the Mangekyo's dōkuriki. At the same time, however, the power of the jutsu increased dramatically, as if completely reborn!
Eager to confirm his findings, Shiyu Uchiha immediately proceeded to use every Fire Release ninjutsu he had mastered. With each activation came that familiar and powerful sensation, drawing him deeper into ecstasy. These Fire Release techniques provided Shiyu with a clear understanding, linking together all of his insights on fire-based techniques.
Only after completing the final Fire Release ninjutsu did he faintly sense the duration of the Mangekyo Sharingan nearing its end. Yet, he remained unsatisfied—he wanted to push the Mangekyo Sharingan further.
Immediately afterward, Shiyu Uchiha unleashed his self-developed combination of taijutsu and ninjutsu—[Great Flame Slash]. This set consisted of nine forms, each imbued with intense blazing power. As he moved, enhanced blades of flame roared outward, exuding unmatched might as if ready to tear through space itself.
Throughout this process, the dōkuriki of the Mangekyo Sharingan blended with his own chakra and flowed into his blade, making each flaming edge even more formidable and incredibly sharp.
Finally, after releasing all nine consecutive forms of the Great Flame Slash, Shiyu Uchiha felt the duration of the Mangekyo Sharingan's effect come to an end. At that moment, profound fatigue filled his left eye—an entirely normal reaction following the use of a Mangekyo Sharingan.
Nonetheless, he understood that so long as he avoided consecutive usage before full recovery, the damage inflicted upon his eyes wouldn't be excessive. Although minor effects still occurred, by taking proper care and avoiding repeated usage during the recovery period, it would still be a long time before his vision suffered any significant impairment.
Therefore, Shiyu Uchiha had the courage to boldly attempt this new method of using his Dojutsu-enhanced techniques.
Moreover, when his dōjutsu deactivated, Shiyu felt as though his body had been hollowed out, losing its support and leaving him feeling weak and limp. The overwhelming weakness left him writhing in discomfort. Even worse, a voice deep within kept tempting him: "Once again! Once again!"
However, Shiyu possessed a firm willpower. He fully understood that overreliance on dōjutsu might lead to unpredictable consequences.
Thus, he gritted his teeth, forcibly suppressed the urge to activate his dōjutsu again, and slowly closed his eyes. When he opened them again, the Mangekyou pattern in his eyes had vanished, leaving only the ordinary triple-comma Sharingan.
After regaining a bit of energy, Shiyu began recalling how he released ninjutsu both under normal conditions and while using his dōjutsu, carefully comparing and analyzing the results in hopes of gaining inspiration.
Through extensive research, he gradually discovered certain patterns and experienced a qualitative leap in understanding both his dōjutsu and Fire Release techniques.
As time passed, Shiyu's comprehension of his dōjutsu deepened significantly, naturally enhancing his mastery of Fire Release alongside it. He began to feel like he could control fire itself at will—the intoxicating rush of that power was almost impossible to resist. At that moment, a strong desire surged from within—he longed to use his dōjutsu again, eager to explore the unknown realm of power.
Fortunately, Shiyu's mental strength proved formidable. He managed to tamp down the urge inside before doing anything reckless. Instead, he decided to apply everything he had realized into real combat, fully digesting his insights first.
In the following days, Shiyu continuously trained and practiced, integrating his understandings into every battle. As the saying goes—hard work never betrays the determined. He successfully grasped the ultimate art of Fire Release, breaking through the bottleneck and advancing his Fire Release Ninjutsu to the Kage-level. At this point, Shiyu's overall strength had already eclipsed what he was before, taking a solid step forward toward becoming a truly formidable expert.
Moreover, since his dōjutsu emerged under the influence of [Mystic · Fire Release · Chakra Mode], after mastering both of his dōjutsu techniques, his control over this chakra mode naturally ascended to a higher level.
Even more importantly, while in this special chakra mode, activating the Mangekyou Sharingan further boosted all of his abilities. Whether it was Fire Release Ninjutsu, his proficient sword techniques, or the Phantom Shifting Body Technique, each technique boosted his power so dramatically that, for a moment, he reached the level of the Five Kage.
Meanwhile, during his in-depth studies, Shiyu made an astonishing discovery: If he first fused ordinary dōkuriki with his own chakra to activate the chakra mode, then activated the Mangekyou dōjutsu and used it to enhance his ninjutsu, the consumption of dōkuriki would be cut in half instantly during activation!
Although the enhancement effect on ninjutsu was slightly weaker compared to before, the consumption of dōkuriki dropped dramatically. However, thanks to the significant enhancement in his fundamental combat capabilities, overall, the destructive power of Shiyu's Fire Release techniques still exceeded their initial levels by a slight margin.
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