Deep in Tobirama Senju's laboratory, the air seemed frozen. The only sounds were the faint hum of chakra-testing equipment and the scratch of a pen across a scroll. The walls were covered with intricate diagrams of the human chakra network and breakdown sketches of various genjutsu. Experimental records lay scattered across the desk, many of them documenting in detail how the Sharingan reacted to different genjutsu. The source of these data was obvious—and steeped in blood and cruelty.
Tobirama stood at the center of a complex array, his eyes closed. His face looked pale from prolonged, intense concentration. His chakra flowed in an extremely intricate and subtle pattern. Unlike the massive Water Style chakra he usually wielded, what he was channeling now was a far more obscure spiritual energy, one leaning toward Yin Release.
Under his control, this spiritual energy moved like invisible threads, weaving through the array and taking shape as it sought to create a special domain that would completely deprive its targets of sight. He had failed many times. Sometimes he couldn't control its range; sometimes its effects were unstable; sometimes it consumed so much chakra that it was impractical in battle.
But this time, something felt different.
He recalled every detail he had observed while casting genjutsu on Uchiha shinobi countless times. He remembered the peculiar fluctuations in chakra that accompanied the Sharingan's ability to see through and reflect genjutsu. He no longer tried to overpower the Sharingan with stronger genjutsu. Instead, he took a different path—creating an environment of "nothingness," an "absolute darkness" with no visual information for the Sharingan to detect and analyze!
"Vision... doesn't depend solely on the eyeballs..." Tobirama murmured, controlling the chakra at his fingertips with the utmost precision. "More importantly, it depends on the brain receiving and interpreting light signals... disrupt that process... or even... temporarily 'cut it off'!"
He suddenly opened his eyes and formed a never-before-seen hand seal that carried an eerie aura.
"Genjutsu: Bringer-of-Darkness Technique!"
There was no dazzling flash, no deafening roar. Centered on him, an invisible ripple that warped the light spread rapidly like waves across water, instantly enveloping the entire laboratory array. Every light source inside—the candle flames, the chakra lamps—still burned and shone, but their light seemed swallowed by an invisible force, unable to travel. The array plunged into a heart-stopping, absolute darkness, where even shadows ceased to exist.
Tobirama maintained the technique, carefully monitoring its chakra consumption and stability. After a moment, he released it, and light returned to the laboratory. A cold, satisfied smile tugged at the corner of his mouth.
He had succeeded. This deadly weapon against visual dōjutsu was finally complete.
He quickly recorded the technique's key details, hand seals, and chakra circulation method on a top-secret scroll. The technique was extremely difficult to master and placed exceptional demands on the user's chakra control and mental strength, so it couldn't be widely taught anytime soon. But even a handful of elite shinobi who mastered it would be enough to turn the tide in a crucial battle!
Soon, a special tactical squad made up of the Senju Clan's most elite jonin and several Uzumaki Clan members skilled in Sealing Jutsu and Barrier Ninjutsu began training in secret, practicing how to work together using the Bringer-of-Darkness Technique.
An opportunity came quickly.
An elite reconnaissance squad of five Uchiha jonin was ordered to venture deep into the Land of Fire's borderlands. Their mission was to investigate the Senju-Uzumaki alliance in detail and locate any possible supply routes. They moved cautiously, keeping their Sharingan active at all times and confident in their perceptiveness and resistance to genjutsu.
But they walked straight into a carefully laid trap.
By the time the Uchiha squad leader noticed the light around them dimming unnaturally, it was already too late.
"Bringer-of-Darkness Technique!"
At a cold whisper, absolute darkness descended! It wasn't the darkness of night, but a pure, all-consuming void that robbed them of every visual signal!
"What's going on?!" "My eyes! The Sharingan can't see anything!" "Is it genjutsu? Impossible! Why can't the Sharingan see through it?!" The Uchiha were instantly thrown into panic and confusion. Their famed vision had been completely useless. An eerie silence surrounded them; all they could hear were their own pounding hearts and their comrades' ragged breaths. They tried using wide-area ninjutsu like the Great Fireball to illuminate their surroundings, but the flames' light was swallowed the moment it appeared, like a stone tossed into an abyss, swallowed without a trace.
Just as they lost their bearings and stood helpless—
"Water Style: Water Dragon Bullet!" "Sealing Jutsu: Four-Limb Heavy Seal!" "Shuriken Shadow Clone Technique!"
Attacks came from different directions, coordinated, precise, and deadly! Blind, the Uchiha couldn't effectively tell where the attacks were coming from or how many there were. Screams rang out through the darkness.
One Uchiha jonin relied on his keen ability to locate sounds and his combat instincts to barely dodge the first Water Dragon Bullet. But a sealing master from the Uzumaki Clan immediately followed up by throwing binding chains around him, instantly suppressing his chakra. He tried to struggle free, but countless shuriken attached to Explosive Tags were already flying at him from every direction...
The battle ended quickly.
When the Bringer-of-Darkness Technique wore off and sunlight fell once more across the forest clearing, all that remained were the bodies of five Uchiha elites and several Senju and Uzumaki shinobi swiftly clearing the battlefield and erasing every trace. There was no joy of victory on their faces, only the composure of soldiers who had completed their mission—and a trace of awe at the terrifying technique they had just witnessed.
The news reached the Uchiha Clan Compound through a special channel.
The entire clan was shaken! Unprecedented panic spread like a plague!
"The entire squad was wiped out? How is that possible? There were five jonin!" "They say... before they died, they couldn't see anything at all..." "It was Tobirama Senju! He must have done it! That damned Forbidden Jutsu researcher!" "Even the Sharingan... couldn't see through that genjutsu?"
The Sharingan had always been the Uchiha's greatest asset, the source of their confidence and their pride in the Ninja World. Now, it seemed that even their most impenetrable shield had a way to be shattered! This collapse in their sense of security terrified them more than a simple defeat ever could.
The following months became the darkest "winter" in Uchiha memory.
Tobirama Senju coldly deployed this new tactic. Though the Bringer-of-Darkness Technique couldn't be used frequently, every time he used it, he targeted an important Uchiha squad or key figure, aiming to kill with a single strike and maximize the psychological impact.
The Uchiha suffered one setback after another in border clashes, and their casualties skyrocketed. Familiar names became cold symbols on the casualty lists, while funeral horns sounded more and more frequently throughout the compound. The clan's strength and morale both plunged into the abyss at a visibly accelerating pace.
The smaller and medium-sized clans that had once been hesitant now became even more determined to align themselves with the Senju after seeing the Uchiha's decline. The Uchiha Clan found itself more isolated and strategically disadvantaged than ever before.
Even Uchiha Hi-kaku, the most aggressive of them all, fell silent during a meeting of the clan's upper ranks as he looked at the latest casualty list, so long it was suffocating. His fists clenched until his knuckles turned white. At last, he slammed them against the table with a stifled roar, but said nothing about rushing into a decisive battle.
Inside Naka Shrine.
Uchiha Madara sat alone in the darkness, the latest battle report spread out before him. He didn't need a lamp; his Eternal Mangekyou let him clearly read every word, every name. Many of those names belonged to young members of the clan he had watched grow up.
The fear and despair reaching him from the outside washed over his heart, already filled with hatred, like a cold tide. He could feel the terror of his people, as well as the complex looks of doubt and hope the elders secretly directed at him.
He possessed enough destructive power to easily shatter the table before him, or even destroy the entire shrine. But he couldn't use it to protect every clan member scattered along the border, nor could he stop Tobirama Senju's insidious, deadly targeted hunts. The helplessness of having power yet being unable to change the situation hurt and enraged him more than any enemy attack.
He closed his eyes, and Izuna's face from his final moments appeared once again. His younger brother had entrusted his eyes to him, hoping he would lead the Uchiha toward prosperity, not destruction.
"...Brother... the future of the Uchiha..." Izuna's faint voice seemed to echo in his ears.
Cold killing intent and his responsibility to protect the clan waged an even more brutal struggle within him. The air inside the shrine trembled faintly with his shifting emotions, radiating a suffocating pressure.
The Uchiha's winter had descended not only upon the clan compound; it had carved itself deep into the hearts of every clan member, including their leader, who possessed the power of a god.
Uchiha Sou had also experienced the terror of the Bringer-of-Darkness Technique firsthand during a patrol. The absolute darkness and loss of perception in that moment would have driven any shinobi to despair. If not for his Weaving Logic sense surpassing itself in that desperate situation, allowing him to barely detect an extremely subtle, abnormal point of "stagnation" in the chakra coming from the caster's direction—that was the peculiar "dissonance" created by the Bringer-of-Darkness Technique as it operated—and if he hadn't relied on instinct to throw all his Explosive Tags in that direction and scare off the enemy, he might not have survived.
After escaping death, he understood even more deeply how insignificant an individual was before the machinery of war. He was also more determined than ever to strengthen his power of Weaving Logic as quickly as possible. Only by understanding and controlling deeper forces could he hope to find a chance to survive the even greater storms to come.
The Uchiha's predicament had brought them to the edge of a precipice. Calls for change, whether toward destruction or survival, were quietly gathering strength amid the oppressive silence.
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