Insight. According to the original lore, the aptitude required to master this jutsu was quite different from strict training or a sensory affinity for gathering chakra. What was needed to learn this jutsu was a steadfast conviction to face any hardship head-on, along with an "unyielding drive to never give up."
To put it in plain English—
It required the user to possess an iron, unwavering will.
However, there was another condition that followed: those who met these requirements still needed the guidance of reincarnation and destiny.
Disregarding the first condition, which seemed rather abstract, Hyuga Yu analyzed the so-called "guidance of reincarnation and destiny" and deduced that it likely referred to the reincarnated chakra of Asura and Indra.
From this perspective, the continuous reincarnation of Indra and Asura was undoubtedly a grand design orchestrated by the Sage of Six Paths, who controlled the Pure Land.
And quite obviously, Hyuga Yu did not possess either of these two types of chakra, nor did he know what kind of ecological niche they occupied within this Six Paths Sage Jutsu. The information Hyuga Yu currently possessed regarding these hidden forces working in the background of the shinobi world was insufficient to allow him to make any further deductions or judgments.
In other words, even though Hyuga Yu's will was incomparably firm, he still lacked certain necessary conditions within this world of "Insight" to completely comprehend the underlying principles and activation requirements of this Six Paths Sage Jutsu.
What exactly was this necessary condition?
Could it be that he absolutely had to undergo reincarnation just like Asura to obtain it?
If so, how did the original Sage of Six Paths master it in the first place?
Hyuga Yu did not know, but a cruel fact loomed before him—
If he did not know, he could not leave. If he did not know, he would be trapped here until he died, unable to escape.
In the world of "Insight," the chakra Hyuga Yu released from his body—whether it was his standard chakra, Byakugan chakra, Cage Bird chakra, Tenseigan chakra, or Zero-Tails chakra—would immediately be assimilated by the countless multicolored specks of light the moment it escaped his physical form, turning into a cog within the world's operational logic.
Furthermore, when Hyuga Yu used his embryonic Tenseigan to observe himself, he discovered to his horror—even he himself was gradually being assimilated by this world.
His fingertips, the surface of his skin, his stratum corneum, his eyelids, and even that embryonic Tenseigan... every single part of Hyuga Yu's body was radiating orange mixed with purple specks of light from the outermost layers of his skin at an extremely slow pace.
That was the physical manifestation of Hyuga Yu's physical and spiritual energy.
To put it another way, Hyuga Yu was being "disassembled" by the world of Insight.
This was the most dangerous and lethal aspect of Six Paths Sage Jutsu—Hyuga Yu did not even know what he was experiencing, nor what kind of phenomenon this was.
Under circumstances where information was completely obscured, he was walking toward a fate far more terrifying than death.
If this situation were allowed to continue, Hyuga Yu would "cease to exist."
Everything from his body to his soul would turn into an entirely different substance. Even the Reanimation Jutsu would be unable to summon him from the Pure Land.
At this moment, Hyuga Yu lifted his palm and looked at his index finger, the tip of which had already vanished. No blood gushed out, but the finger bone, along with the cross-section of blood vessels, meridians, and muscle fibers, was clearly visible.
Hyuga Yu did not panic, nor did he feel fear. Granted, upon discovering this phenomenon, he was physiologically terrified enough to exhibit various abnormal symptoms—his heart rate accelerated, his sweat glands secreted rapidly, his blood flow quickened, his entire body heated up, his face flushed, and his adrenaline surged...
He simply went ahead and manually severed the nerves that perceived fear.
With a completely calm expression, Hyuga Yu stared at his palm, recording the rates of his body's disintegration and regeneration, and mentally estimated the time left before he would be fully disassembled—five hours.
Following that, Hyuga Yu shifted his attention to another aspect—
Namely, after accidentally entering the world of "Insight," which belonged to the absolute ceiling-tier Six Paths Sage Jutsu of the current shinobi world, what benefits could he reap for himself?
Rather than waiting helplessly to die in fear and hesitation, Hyuga Yu preferred to take action, even if it ultimately proved to be an exercise in futility.
Before long, Hyuga Yu calmed his mind, quietly sensing his own state, the influence the world of Insight exerted on him, and the various physical changes that occurred after entering this domain. While he was being disassembled and assimilated, he discovered that the tiny, multicolored specks of light in the world of Insight were also intertwining with his body. In fact, there were signs of a certain "fusion" taking place.
As this fusion commenced, Hyuga Yu quickly noticed that these multicolored specks of light were not all identical. Among them, the orange, purple, green, and red specks of light fused much more harmoniously with his body. These four colors corresponded directly to four of the seven basic elements that constructed the world: Yang, Yin, Wind, and Fire. Coincidentally, these were also the four ninjutsu natures and Tenseigan chakra natures that Hyuga Yu currently mastered.
Immediately after, Hyuga Yu began to actively mobilize his chakra, attempting to alter its forms and properties to attract the external specks of light, guiding them to flood into his body to actively accelerate the completion of this "fusion" process.
He first tried using gravitational and repulsive forces. Clapping his palms together and parting them slightly, he created a gravitational core similar to Planetary Devastation within his palms, attempting to indiscriminately pull in the surrounding specks of light. He also used Wind Style - Almighty Push to construct a circular wall of repulsive force further out, aiming to push the distant specks of light toward himself.
The result of this attempt was completely ineffective.
In fact, it caused Hyuga Yu to experience agonizing pain—a sharp, excruciating sensation as if his body were being rammed and crushed by a ten-thousand-ton truck.
During this process, the larger specks of light were wrenched by the gravitational force, causing them to collapse and scatter into even smaller specks that slammed into Hyuga Yu all at once. Hyuga Yu instantly realized he could no longer breathe. In the real world outside the vision he saw, something seemed to be frantically converging and crashing into him. Ultimately, these physical objects choked off the breathing space in Hyuga Yu's nasal passages, making him feel as though he were buried deep underground.
He quickly realized that the world of "Insight" he was seeing was essentially another expression of the real world. He was indeed within the world of Insight, but he also existed in the real world.
By creating a Planetary Devastation centered on himself in the real world, the only consequence would be that Hyuga Yu—much like Naruto in his Six-Tails form when sealed by Pain—would be constantly struck, piled up, encased, and sealed by a barrage of flying boulders.
This was practically hitting himself.
Furthermore, after the larger specks of light collapsed, the even smaller particles—those quark-level microscopic substances—remained exactly where they were, passing straight through the gravitational and repulsive waves without any sign of being drawn in.
Though his first attempt failed, Hyuga Yu was not discouraged. He immediately hooked his body's respiratory system into the internal breathing matrix of Wind Style: Current Refinement and began his second attempt. This time, he utilized his Tenseigan chakra. Hyuga Yu manifested hundreds of large Yin-Yang Style black receivers, each tens of meters long, crisscrossing and connecting them to form a massive radar network. He attempted to use the strong magnetic fields inherent to the black receivers and the established communication network to influence the specks of light in the world of Insight. In theory, this network could receive chakra signals from thousands of kilometers away and possessed an exceptionally potent capacity to drain chakra.
Regrettably, this method also failed to yield any results.
Hyuga Yu then went on to create chakra beads, altering them into different nature transformations.
Fire Style, a plasma-state vortex—ineffective.
Wind Style, spontaneously converging gravitational and repulsive forces—ineffective.
Yang Style—this refined an incredibly exaggerated amount of life force within Hyuga Yu's body, to the extent that the life force formed a torch-like shape, turning him into a "man of light." By compressing this life force to its absolute limit, he triggered a Yang Style storm similar to the one that had erupted in his previous Yang Style laboratory, attempting to indiscriminately absorb all surrounding organic matter.
However, it was still ineffective.
Yin Style—Hyuga Yu could not see any practical use for this spiritual sphere—ineffective.
As Hyuga Yu continued his non-stop attempts, time ticked away second by second. One hour, two hours, three hours...
When the final hour arrived, the majority of Hyuga Yu's body had already disintegrated. Only his head, half of a legless torso, and a single arm remained.
Yet he remained calm, calm to a terrifying degree.
A manic gleam of absolute composure flickered within his eyes!
At this point, Hyuga Yu finally discovered a clumsy method that could effectively draw these microscopic specks of light—or rather, natural energy: piling up chakra.
He gathered his chakra into a single mass and compressed it continuously, using a principle similar to the Wind Style: Rasenshuriken. However, he took it a step further, compressing the baseline chakra—which contained only physical and spiritual energy—to its absolute limit, forming a nearly solid, fingernail-sized orb of pitch-black chakra. It was not a Rasengan, nor was it a Tailed Beast Bomb. Rather, it was a product born after Hyuga Yu had attempted 1,326 variations, decomposing the four-natured Tenseigan chakra back into physical and spiritual energy, mixing them in a strict 6:4 ratio, and compressing it past its limits dozens of times using Almighty Push. It concentrated almost the entirety of Hyuga Yu's chakra.
Its destructive power was equivalent to the detonation of four giant Tailed Beast Bombs, capable of completely wiping the entire territory of a small nation off the map in an instant, and it possessed a terrifying mass that could pierce through a giant Tailed Beast Bomb in a single strike.
Only upon reaching this step did this chakra orb finally begin to display a powerful pulling effect on the specks of light in the world of Insight.
As for what underlying principle was at play, Hyuga Yu no longer had the luxury of time to analyze it. Having experimented to this point, all he could do was commit this phenomenon to memory and make his final gamble—
Driven by this powerful attraction, those specks of light that had previously remained utterly indifferent to Hyuga Yu finally began to move. In the multicolored world, the orange, purple, green, and red specks of light peeled away from the vibrant environment, converging toward Hyuga Yu's mangled remains and merging into his head, torso, and arm.
The four attributes of light specks "fused" with Hyuga Yu's body. Ultimately, under this convergence, they transformed into a certain "whiteness" that Hyuga Yu found incredibly familiar.
It was exactly the same white he had initially witnessed at the absolute baseline of the world of Insight—a void that resembled a blank sheet of paper waiting for someone to leave their mark upon it.
Yet at this moment, not a single shred of chakra remained within Hyuga Yu's body.
Even the Hashirama cells had been extracted to their absolute limit, becoming completely necrotic and turning into waste that entered Hyuga Yu's circulatory system. As the Hashirama cells died and lost their vitality, his original flesh turned to pus, flowing out from his abdomen, leaving a bloody hole that was impossible to close.
Moreover, even Hyuga Yu's own circulatory system was collapsing. What he was doing right now had already exceeded the limits he had originally established, far surpassing the consumption that could be produced by two all-out battles.
The world before Hyuga Yu's eyes began to flicker unsteadily.
He calmly deduced that this was because his body had entered the final countdown to collapse—he was about to die.
As death drew near, Hyuga Yu's mind remained calm to the absolute extreme. Or rather, this was precisely his ultimate backup plan!
Hyuga Yu's reckless experimentation was exactly for the purpose of killing himself at the very end.
He could not afford to die from the disintegration of the world of Insight; if he had to die, he could only die by his own hand!
Because in the shinobi world, death was not the absolute end.
Hyuga Yu's pair of Byakugan remained in Hiruko's possession. Four and a half years later, when the visitors from outer space arrived and the world fell into utter chaos, someone would inevitably place their hopes on him to save themselves, attempting to bring him back via the Reanimation Jutsu. Hyuga Yu already knew the hand signs for the Reanimation Jutsu, and with the power of his Tenseigan chakra, breaking a mere Reanimation Jutsu would be an incredibly easy task.
When that time came, Hyuga Yu would still have a chance to live another life. Whether through the Rinne Rebirth Jutsu or some other technique, he would have an opportunity to achieve a true resurrection.
Sensing the state of his body, Hyuga Yu took a deep breath, calculated the precise amount of time he had left, and took one final look at the perilous world of Insight before him—this ultimate Six Paths Sage Jutsu.
He began to count down silently. "3."
"2."
"1."
As the countdown concluded, Hyuga Yu felt his vision plunge into darkness, his consciousness completely freezing at the final second of the countdown.
Hyuga Yu was dead.
However, right at that moment, the consciousness that had completely fallen silent suddenly revitalized, and Hyuga Yu snapped his eyes open once more!
He suddenly felt a surge of vitality—a burst of life force rising precisely from the location of the bloody hole in his abdomen!
Hyuga Yu immediately absorbed this life force and squeezed out the absolute final shred of Yang Style chakra his body could refine!
Extending a finger, he pressed it right against the center of his brow.
In the next instant, that paper-like blank void finally gained its very first color—a world-creating gold!
Like the sweeping strokes of a dragon and snake, or the partitioning of Yin and Yang as chaos ripped open, his empty body felt as though power had been injected into it once again. Formless things began to flow around that single "golden" speck of chakra at the center of Hyuga Yu's brow.
Natural energy, physical energy, spiritual energy, and the four chakra attributes of the Tenseigan spontaneously formed a faint, platinum-gold chakra within Hyuga Yu's body.
This single speck of platinum-gold chakra plunged deep into Hyuga Yu's flesh, muscles, meridians, bones, bone marrow, and cells, causing countless specks of light to begin flooding into his body!
In the next instant, the world before Hyuga Yu's eyes began to shrink frantically!
From blank space to vibrant colors, from vibrant colors to quarks, from quarks to gluons, from gluons to photons...
Ultimately, his vision returned to normal!
Beneath endless dark clouds, Hyuga Yu saw Mount Myoboku, which had been completely reduced to a wasteland, as well as...
A massive, wrinkle-covered, ancient, and somewhat exhausted orange toad face.
————
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