Acting on sheer instinct, Shiyu Uchiha instantly realized the opponent's dojutsu had awakened—likely an incredibly powerful offensive technique. Reflecting on this, he couldn't help but admire Fugaku Uchiha's immense potential in mastering dojutsu. Normally, awakening the Mangekyo would eventually lead to a dojutsu, though it required a transitional phase. Yet Fugaku's transformation had occurred unusually quickly.
To prevent Fugaku from becoming overly intoxicated with the unparalleled power of the Mangekyo and losing himself, Shiyu decided to personally reveal the true essence of the Mangekyo, along with his own profound insights into its nature. Without hesitation, he earnestly passed on the Mangekyo Chapter—a technique he'd developed over years of study—to Fugaku.
At the same time, Fugaku honestly recounted to Shiyu every detail of how he had awakened his Mangekyo Sharingan.
It turned out that after the previous stage of war between Konoha and Iwa had ended, while Fugaku was carrying out patrol duties at the rear, he unexpectedly encountered Sho of the Explosion Release—the same ninja they had clashed with before. Naturally, there were no words exchanged upon meeting; both immediately engaged in battle.
Although Fugaku was undeniably strong, he was just an elite jonin, and no match for Sho, who wielded the Explosion Release. However, with the assistance of his comrades, he ultimately managed to drive the formidable enemy away.
But tragically, during the intense fighting, one of Fugaku's closest comrades-in-arms bravely stepped forward and took the full force of Sho's devastating [Thunder God Fist] upon himself.
At that moment, overwhelmed with grief and fury, Fugaku's intense emotions stimulated the Uchiha bloodline within him, instantly triggering the immense hidden power inside him to its peak, successfully transforming his triple-comma Sharingan into the Mangekyo Sharingan.
After listening carefully to Fugaku's account, Shiyu pondered deeply for a while, inwardly concluding that this was likely just a coincidence, without any secret manipulation by the mysterious elder master behind the scenes.
Upon realizing this, the heavy stone that had long hung in Shiyu's heart finally lifted slightly, and he couldn't help but let out a long breath—it was relief after suspecting someone so formidable might be involved.
Then, unable to suppress his own curiosity, Shiyu eagerly asked, "Brother-in-law, since you've successfully awakened the Mangekyo Sharingan, I suppose your unique dojutsu in your left eye has also been awakened? I'd really love to know—what exactly is its ability?"
Fugaku, naturally having no suspicion toward Shiyu, responded solemnly: "[Takemikazuchi] is the dojutsu! This technique manifests as terrifying black lightning with destructive power surpassing any ninjutsu I have ever seen. However, there is a problem—it is extremely difficult to control, nearly impossible to manipulate precisely, and it places a heavy strain on the eyes."
From your description, this kind of power seems to be the product of a perfect fusion between Mangekyou Dojutsu and Lightning Release ninjutsu. Coincidentally enough, the techniques I specialize in the most are exactly Lightning Release.
If that's the case, then my direction for future effort should be modeling after my own Mangekyou Dojutsu characteristics, attempting to combine third tomoe with Lightning Release and apply it effectively. But strangely, why has the clan left no related records at all?
Upon hearing this, Shiyu Uchiha shook his head helplessly and sighed, then began to explain: "The clan's foundation was completely lost the moment that person left. Although many of our clan members back then still retained faint memories in their minds, the subsequent outbreak of the brutal Naraka Yomi War caused numerous clan members to perish in Yomi.
As for not informing you about this earlier, it's actually restricted by our clan's rules—those who haven't developed their triple-comma Sharingan to its peak state, meaning they lack sufficient mastery over dōkuriki, are forbidden from knowing such advanced paths.
It was believed that following this practice could improve one's chances of awakening the Mangekyou Sharingan, though whether this is actually true remains unclear. Precisely because of this uncertainty, everyone silently followed the regulation without question. Unfortunately, speaking from personal experience, I personally haven't sensed any significant effect from it. Rather, I believe this particular power proves far more reliable than the Mangekyou."
Actually, aside from Shizhi Uchiha, who didn't want Mikoto Uchiha and her younger brother Shiyu to awaken the Mangekyou, thus disregarding this rule altogether, the rest of the Uchiha clan viewed the Mangekyou as the pride of our family and therefore naturally held onto these beliefs.
Shiyu Uchiha's words struck like a thunderclap out of a clear sky in Fugaku Uchiha's ears, plunging him into instant silence. A surge of indescribable anger surged through his heart toward that elderly man, filling him with intense murderous intent so extreme he even wished to dig up the corpse and beat it.
However, what Shiyu Uchiha said next managed to briefly shift his focus.
With a calm yet determined expression, Shiyu Uchiha continued slowly: "Though the complete manual no longer exists, fortunately, my mother once painstakingly collected several fragments detailing the combination of third tomoe dōkuriki with Lightning Release.
Please wait a moment while I summon Saya right away to fetch it for you." Having spoken, Shiyu Uchiha swiftly formed hand seals and muttered lowly, activating the Summoning Jutsu. With a rising swirl of smoke, a small, adorable ninken—Saya—appeared before them all.
Gently instructing Saya, Shiyu softly warned: "Saya, please go retrieve the scroll stored inside the Secret Chamber for me. Don't mess this up, no matter what!" Facing the solemn tone from Shiyu, obedient Saya nodded politely before promptly turning around and disappearing into the smoke.
During the wait for Saya's return, Shiyu continued speaking: "Once you succeed in combining third tomoe dōkuriki with Lightning Release, you'll certainly achieve complete mastery over your dojutsu, reaching a level where your control becomes intuitive. And your dojutsu, in turn, will support your efforts merging third tomoe dōkuriki with Lightning Release—the two can work hand in hand perfectly."
Fugaku Uchiha nodded upon hearing this, his eyes revealing a trace of anticipation. Shiyu Uchiha immediately knew what was going on—those who had just awakened the Mangekyou always acted this way. Overflowing with confidence, they inevitably believed that mastering just a single scroll of Secret Jutsu would be effortlessly accomplished. So Shiyu didn't even bother to explain further.
Not long afterward, Shiyu once again performed the Summoning Technique, calling forth Saya once more. The moment she materialized, Saya carefully handed a small scroll over to Shiyu Uchiha. Shiyu took the scroll and gave it a close look, confirming that the character "Thunder" was indeed written on it before nodding in satisfaction.
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