The essence of a Zanpakuto is the mapping and interpretation of a Shinigami's own soul.
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The former Aizen Sōsuke's mapping of Kyōka Suigetsu was hypnosis and manipulation, playing everyone like puppets.
By completely mastering the five senses of others, he created illusory lies.
Weaving lies is "Kyōka," and it was the true color of this segment of his life.
However, after experiencing failure and reincarnation, his new body and self allowed him to gradually shift from the nothingness that followed the Hōgyoku's failure and the bursting of his illusory bubble, toward a more tangible shaping of reality.
Thus, "Suigetsu" was born.
"Clang!"
In front of the short blade that struck the empty space, there was clearly nothing.
But the moment the short knife fell, Senju Tobirama seemed to hear the crisp sound of clashing metal.
It was as if something in this world had been severed.
Memory, body, consciousness.
All abruptly froze at this moment, as if forgetting the struggle they had attempted just a second ago.
Even the Chakra, which was rushing toward the last Mutually Exploding Tag on his chest according to the sealing pattern just before his soul was about to dissipate, fell into nothingness at this moment.
Suddenly, it transformed into a brightness that rose around his body like flames.
"Whoosh!"
The suddenly surging Chakra burst forth like a punctured water balloon.
After that, nothing happened.
At this moment, the venue was silent.
Senju Tobirama stood there dumbfounded, as if he had turned into a stiff shell.
"Where is my jutsu?"
Thinking this subconsciously, he looked blankly toward Aizen, staring at the short blade that had already fallen, and understood the source of the problem.
"You...
"
"What exactly did you do?"
Aizen Sōsuke remained standing quietly in his original spot, looking at him with the same composure as before: "Nidaime(2nd)-sama, haven't you already figured it out?"
"Changing the past?!"
At this moment, Senju Tobirama, realizing what had truly happened, suddenly had his eyes wide with fury, and his pure white hair bristled.
Even his final means of mutual destruction was so easily nullified by the young man before him, causing the future Nidaime Hokage to lose his usual composure, and he looked at Aizen in disbelief: "That's impossible!"
"How can a Genjutsu of this magnitude exist in this world!"
"If a jutsu of this magnitude exists, then wouldn't it mean..."
"
Wouldn't it mean that even if my Older Brother were revived, he would have no chance of defeating the young man before us?
Just thinking this, an intense despair, coupled with an unprecedented sense of terror, surged uncontrollably within Senju Tobirama's heart.
If this is the case, who else in this world can stop this man?
Having held on until this moment, even the forbidden Soul Jutsu was finally unable to suppress the signs of his body's impending death.
Great mouthfuls of blood continuously poured from Senju Tobirama's mouth. The final collapse of his bodily functions made him unable to remain standing, and he sank weakly to his knees on the ground.
The coldness in his body spread further, allowing him to feel the passing of his life in the clearest way possible.
Aizen Sōsuke looked at Senju Tobirama, who was kneeling weakly on the ground, and shook his head slightly: "The power possessed by 'Suigetsu' is not so overbearing."
"All she can do is slightly deceive reality, based on sufficient causal conditions and a huge price."
For example, after understanding Senju Tobirama's trump card, she rewrote the spatial connection between the Mutually Exploding Tag and Senju Tobirama's stored Explosive Tags.
Senju Tobirama stared fixedly at him; the blood he vomited and his powerless limbs made it impossible for him to speak anymore.
Only his gradually dimming eyes reflected such despair.
Aizen quietly watched this scene.
In fact, there were many "truths" he hadn't revealed.
Even he had to pay a considerable price when using such incredible abilities.
Chakra, life force, a part of his soul, or massive amounts of energy.
If he slightly exceeded the limit, it was entirely possible for him to die on the spot.
This was fundamentally not a power that Aizen Sōsuke, being a "Ninja," should be able to wield.
His body could not bear such immense soul power.
So far, he had only used it twice in this Ninja World.
The first time was planting the Seed of Hollows, which should not exist in this world, within Uchiha Obito's Kamui Dimension.
The second time was today.
But soon, it would be the third time.
"Boom—!"
Almost the instant Aizen's voice fell, the majestic power of the Dragon Veins beneath his feet finally broke through the seal like a surging spring, flowing straight up and out.
Transforming into a massive pillar that pierced the heavens and earth.
Aizen's figure was completely bathed in the center of the vast, scattered radiance, causing his shadow to be infinitely stretched.
Uchiha Itachi in the distance, and the stunned Kakashi Hatake, quietly watched this scene, seemingly speechless.
Suddenly, a warm, large hand rested on Kakashi's shoulder.
He turned his head stiffly and saw Minato-sensei standing up from the ground, supporting his collapsed chest, and leaning heavily on his shoulder.
Several trails of blood slowly trickled from the corner of his mouth, yet the face of the blond young man still wore a reassuring smile.
"Run, Kakashi.
"Minato... Sensei?"
Kakashi Hatake looked at him blankly.
However, Minato Namikaze only left him with this single sentence.
Then, he slowly straightened his back, which was hunched over in extreme pain, and walked step by step toward Aizen Yūsuke, gradually moving out of Kakashi's sight.
Finally, when he reached the area in front of Aizen, his steps halted.
"No wonder you were determined to come here, even after seeing through Lord Orochimaru's scheme."
Minato Namikaze slowly exhaled, staring straight at the man in front of him: "Your sword requires a massive price to function, which is why you targeted the power of the Dragon Veins."
"It's just, I don't understand."
"Aizen Sōsuke."
"What exactly do you intend to change with such immense power?"
Listening to Minato Namikaze's voice, Aizen did not turn around. Instead, he watched the scene of the Dragon Veins' power surging out at an unimaginable speed, as if admiring a magnificent landscape, and spoke softly: "Yondaime(4th)-sama."
"If I were you, I would be lying there properly, quietly waiting for all this to end."
"It is quite difficult to control the force needed to crush an ant twice in a row without killing it."
Minato Namikaze did not speak, merely looking at him quietly.
After a moment of silence in the area, he shook his head slightly, turned to face Minato Namikaze, and smiled: "I intend to create a monster unlike any the world has ever seen."
"It will originate from human malice, harvest human souls, and be used by me."
"After its appearance, everyone in the Ninja World will face a new survival crisis, separate from the Ninja."
"At the same time, it will maximize the spread of malice at the root of human nature, becoming a terrifying force."
"I shall name it 'Hollow'."
Synchronously implanting an entirely new concept across the entire world is not an easy task.
To achieve this, he has already anchored the existence of Hollows in the future era, fixing it as the "effect."
And what he needs to do here now is establish the "cause" of its existence.
These monsters will become the source of his power and tentacles for gathering souls in the future, rapidly spreading and growing as time progresses.
Minato Namikaze did not understand these things; he only grasped one sentence: "Playing with human souls?"
"This is something I absolutely will not allow."
The next moment, he formed the final hand sign.
Hands clasped together.
At first, Aizen looked at him with some curiosity, seemingly wondering what trump card Minato Namikaze could possibly have at a time like this.
But gradually, as the energy fluctuations appearing in this narrow space became increasingly abnormal, even he couldn't help but raise an eyebrow.
"Wong—!"
In an instant, the moment Minato Namikaze clasped his hands, the Chakra, scattered like smoke, gradually withdrew from behind him, transforming into a massive, translucent figure hovering high above his back.
Clad in a white robe, with two horns on its head, a face like a malevolent demon, and a short blade in its mouth.
Almost the moment this figure appeared, Minato Namikaze's unique soul transformed into a humanoid Chakra form, appearing in the center of that figure.
Like a sacrifice offered on an altar.
"Reaper Death Sealing Technique."
Minato Namikaze, with blood in his mouth, looked resolutely at the man in front of him.
"This is the Uzumaki Clan's strongest sealing jutsu, representing inescapable death."
"Aizen Sōsuke."
"I don't know what exactly you want to change this world into."
"However, whether it is for Konoha or for the entire world, I absolutely cannot allow a man like you to continue existing."
"You are simply too dangerous."
However, at this very moment, Aizen was not looking at him, but was staring intently at the figure standing behind Minato Namikaze.
Deep within the eyes obscured by the thick spectacle frames, there was an uncontrollable surprise.
Even Senju Tobirama's previous trump card had failed to elicit this expression from him.
What did he see?
Souls!
Countless souls!
Beneath the surface of this body were traces of spiritual pathways, lines he had never seen since arriving in this world.
Innumerable and endless.
All densely packed and crowded beneath this massive Shinigami body.
It was as if this figure in front was not a symbol of a seal, but the entrance to the Pure Land.
What is this thing?
Since arriving in this world, this was the first time Aizen had felt such intense curiosity.
However, Minato Namikaze clearly had no intention of satisfying his curiosity.
"Die—!"
Following that desperate roar, an arm covered in curse marks suddenly tore out from Minato Namikaze's abdomen, ripping through his clothes, and swiftly lunged toward Aizen Sōsuke.
The speed of that arm was unlike anything mundane; it was more akin to a certain rule.
Almost the moment it appeared, it had firmly locked onto him.
In just a flash, the arm covered in curse marks had already connected the two bodies.
Aizen Sōsuke frowned slightly.
Clearly, this arm was not affected by "Kyōka."
In fact, it wasn't even controlled by Minato Namikaze himself.
All Minato Namikaze did was use his own soul as a sacrifice to anchor reality and the target.
Seeing this, Minato Namikaze's heart immediately filled with joy.
As expected.
This man is not physically invincible in the absolute sense.
"Hah!"
The next moment, he roared, attempting to use the Reaper Death Sealing Technique to extract Aizen's soul from his body.
The arm covered in curse marks tightened for an instant, and its end even retracted a bit toward Minato Namikaze's abdomen.
Then, the curved arm instantly became taut, like a rope stretched to its limit.
Watching this scene, Minato Namikaze's eyes widened instantly.
Aizen Sōsuke looked at him thoughtfully, then looked at the malevolent demon floating in mid-air, which seemed to have no self-awareness.
"A secret jutsu for forcibly dragging out souls?"
"Sealing Jutsu is truly amazing."
"It's just...
"
"Do you truly possess the ability to steal my soul?"
As Aizen spoke, Minato Namikaze also felt the extremely heavy weight radiating from Aizen's body.
The pull of the Reaper Death Sealing Technique was completely unable to contend with it.
Minato Namikaze even realized in despair that let alone pulling out Aizen's soul, his own soul showed signs of being forcibly extracted from within the seal, and his entire body was involuntarily being dragged forward toward Aizen.
"How... how is this possible?!"
At this moment, he finally felt the despair that Senju Tobirama had experienced earlier.
However, after confirming that this jutsu posed no threat to him, Aizen instead developed some interest in the Shinigami figure behind him. As if connecting it to something, he continuously examined it.
Finally, seeing Minato Namikaze looking like he was about to collapse under the strain of the jutsu, Aizen even voluntarily relaxed some restrictions, allowing his soul to be pulled by the large cursed hand, drawing it out of his body little by little.
Feeling the loosening of this force, a glimmer of hope rekindled in Minato Namikaze's deeply despairing heart, and he continued to pull with all his might.
However, what was being dragged out of the opponent's body was not a humanoid soul, like his own.
Minato Namikaze stared in astonishment at the man before him.
What the large cursed hand grasped was a corner of something pure as white jade, appearing solid and materialized.
When dragged out a little further, its full appearance gradually became visible.
It was a finger.
The fingernail alone was larger than the volume of an ordinary human body, and half a knuckle was nearly the size of the Shinigami trunk behind him—a gigantic finger.
At this moment, the section of the large cursed hand extending from his body was like an ant extending its antenna, forcibly pulling on a person's fingertip, dragging it little by little toward himself, crushing down on his body like a mountain.
"Buzz... buzz buzz buzz...
"
Just that section of fingertip, dragged out of Aizen's body, instantly approached his soul. Minato Namikaze felt an irresistible, substantial force powerfully grinding against the surface of his soul, making it almost impossible for him to maintain his own consciousness.
That was the purest form of—the weight of souls—from two different dimensions.
"What kind of soul... At this moment, Minato Namikaze let out the final roar of his life.
However, that piece of Aizen's soul paid no further heed to his voice; it simply pressed forward little by little, gouging toward the tiny phantom reflected behind him.
Until the moment they made contact.
Tearing!
The instant he saw that scene, Minato Namikaze's consciousness plunged into infinite darkness.
But at this moment.
Aizen Yūsuke's consciousness, following the contact between the souls, arrived in another deep, dark space.
Within this boundless space, countless silent, scattered sparks of light, like tiny flames, were dotted around.
Like a starry sky reflected beneath his feet.
Aizen paid no attention to those souls that still had consciousness but had fallen into slumber. Instead, he looked toward the very center of that inverted starry sky.
There, seated cross-legged, was a figure like the Shinigami of the Reaper Death Sealing Technique, clad in white, with white hair and beard, nine black orbs floating beneath him, completely motionless above the void of the Underworld.
It seemed to sense the arrival of a guest.
The old man, staff resting on his lap, slowly opened his eyes and stared indifferently at the young man before him.
After a long while, he continued to stare, opening his mouth with a hoarse, slow voice that seemed to carry a hint of confusion: "Aizen Sōsuke."
"What, exactly, are you?"