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Kael felt as if he were in a blazing furnace at this moment, the boundaries of his body constantly being broken down in the smelting process, transforming towards another form.
This kind of experience and feeling was not absent from his memory.
The marvel Kael, under the guidance of the Ancient One, had once transformed his life form to a certain extent, taking a major step towards the concept of a Dimensional Lord.
This time, however, he was the only one at the helm of his evolution.
His body temperature soared rapidly, his heart beat at a high frequency within his chest, and his lungs acted like bellows, using life itself as fuel to burn fiercely.
Crimson Markings emerged on Kael's forehead like flames, and his originally pitch-black, short hair seemed to be ignited, turning red.
This meant that the Breathing Style's development of his body had entered the next stage.
The Markings, glowing with firelight, merged into the shape of a red sun, etched above his brow.
The brilliance belonging to the Ark Rune gradually became clearly visible in Kael's eyes like bursting sparks.
The power of this rune crossed dimensions, anchoring Kael's humanity and allowing him to avoid losing himself to the unspeakable during this solo evolution.
Yoriichi Tsugikuni was indeed an unimaginable genius.
In a sense, he carried the luck of a century, born specifically for Kibutsuji Muzan.
The Sun Breathing created by Yoriichi Tsugikuni could actually become an extension of the concept of the "Sun."
Precisely because of this, only "Sun Breathing" could slay Kibutsuji Muzan and inflict true damage upon him.
This was a collision between two concepts.
While our Demon King was indeed a bit weak and cowardly, his pursuit of eternal immortality was matched by few, to the point that the demon's immortality was almost fixed as a concept within him.
If he were to truly get his wish and gain immunity to the sun, there would likely be no means in this world to truly kill him.
The moment the Markings took shape, Kael almost became the embodiment of the blazing sun.
This was not a figure of speech, but a statement of fact.
He had truly grasped a part of the concept of the "Sun," at least the part on the surface level.
That moment of life sublimation almost caused Kael to be assimilated by the concept of the "Sun."
However, the dangers of this part of the process were all within Kael's calculations, so it wasn't particularly thrilling.
In the Ancient One's collection of books spanning the multiverse, there were many examples of stealing concepts to become gods; there were all sorts of wild tricks that those ascending to godhood could pull off.
Compared to them, Kael's process of mastering the concept of the "Sun" seemed unremarkable and bland.
After all, the scale of the Demon Slayer world was limited.
In a world where the supernatural was not prominent, no matter how grand the symbol of the "Sun" was, its conceptual existence was like Schrodinger's cat—either there or not, never fixed.
Kael and the concept could be said to have fulfilled each other.
All of this happened in the space of a single breath.
Kokushibo did not know what Kael had done, and it launched an attack immediately.
This was also Kibutsuji Muzan's command.
It wanted the remaining two upper ranks to buy time for its escape.
Kokushibo didn't care about being abandoned; its six demon eyes stared fixedly at Kael, containing a hint of expectation.
As a first-generation Breathing Style swordsman, Kokushibo had already awakened the Markings while still human and mastered the Transparent World, making him almost the second only to Yoriichi Tsugikuni.
Precisely because of this, it knew the strength of its younger brother better than anyone.
However, even after eventually abandoning its humanity and gaining the power of a demon, Kokushibo still could not defeat Yoriichi Tsugikuni; the gap between the two was too vast.
It seemed that compared to immortal creatures like demons, Yoriichi Tsugikuni's existence was even more unreasonable.
Even though Kokushibo had mastered both the Markings and the Transparent World, it could never catch up; this hadn't changed since Yoriichi Tsugikuni first showed his talent as a child.
Ultimately, this jealousy turned into endless hatred.
But at this moment, Kokushibo felt somewhat relieved; it turned out there was someone even more unreasonable than Yoriichi Tsugikuni. It really wanted to see what kind of expression its brother would have upon seeing Kael.
Though thinking about it, he would probably be quite indifferent and calm.
Regarding power, Yoriichi Tsugikuni never had any obsessive pursuit; Kokushibo knew this well.
As Kokushibo attempted to observe Kael with the Transparent World, its six demon eyes turned to ash in an instant.
That feeling was like staring directly at the blazing sun; even with Kokushibo's own self-healing ability, the lost eyes were slow to recover.
That power belonging to the sun remained in the wounds, impossible to erase or remove.
However, for Kokushibo, even losing its eyes didn't greatly affect its combat power; its other extraordinary senses were enough to compensate for the lack of vision.
"Moon Breathing, Sixteenth Form: Moonbow, Half Moon."
Kokushibo raised the blade forged from its own flesh and bone, "Kyokuseiki," and used the Breathing Style it had refined for hundreds of years.
Sword qi and Blood Demon Art merged, turning into rounds of eerie and strange crescents that slashed down towards Kael's position.
However, in the next second, crimson light and heat erased Kokushibo's sword technique and its very existence; the entire process caused no ripples, as calm as a drop of water merging into a river.
Under this crimson light and heat, half of the entire Infinity Castle instantly turned into nothingness.
The "Infinity Castle" controlled by Nakime was itself an alternate space formed by a Blood Demon Art, usually only hiding in shadows where light could not reach, belonging to the darkness.
When shadows are struck by light, they naturally cease to exist.
Kael glanced at the nichirin blade in his hand, which had also turned to ash, and couldn't help but feel a bit of regret. After all, it was a weapon that had been with him for so long; how did it just disappear with a little bit of force?
With the strike he had just made, it wasn't just Kokushibo who was sent off; Akaza, who was not far away, was also caught in it, and the result naturally went without saying.
However, of the two, one went down, and the other went up.
Kael, having seized a part of the "Sun" concept, could easily see the destination of souls through the Material Realm, even though his physical body still stood in the real world.
The Demon Slayer world was a sandwich structure.
A Material Realm was sandwiched between two layers of soul realms.
Akaza's lover had been in the gap between life and death, waiting for his return.
Losing Kibutsuji Muzan's control, Akaza naturally remembered the past.
The couple was currently expressing their gratitude to Kael.
"Since your relationship is so good, how about being a pair of good siblings in the next life?"
Kael suggested with a smile.
To be fair, he really did have that kind of power now.
With the status Kael now held, it would be much easier to take charge of the upper and lower soul realms than the Material Realm in the future.
The home of life's spirituality did not have the strict rules and constraints of the real world.
Hearing this, Akaza's face instantly turned white with fear.
He could atone for the mistakes he made as a demon, but definitely not in such a way.
Great god, please don't play with me.
"Just kidding, go on up now."
Kael waved his hand.
As for Kokushibo, there was no doubt it went down to atone for its sins.
Kael didn't give it another look, turning to look in the direction Kibutsuji Muzan had fled.
Nakime could no longer control the disintegration of the "Infinity Castle," and Kibutsuji Muzan had nowhere left to hide.
Losing the connection point between this alternate space and reality, Nakime naturally lost her spatial transfer ability.
Kibutsuji Muzan was soon exposed within Kael's sight.
"Damn it, they're all useless!!"
Kibutsuji Muzan was having a bit of a breakdown, unable to muster the courage to fight Kael at all, only wanting to flee far away.
It must be said that in terms of running for its life, it was indeed a professional.
The moment Kael raised his hand, Kibutsuji Muzan's body split into one thousand eight hundred pieces.
These fragments were very small, like a fine rain, and each one could carry its entire consciousness; Kibutsuji Muzan could fully regenerate from any one of them.
If even a single piece escaped, it would be very difficult to catch Kibutsuji Muzan again.
This guy definitely had the persistence and will to hide deep underground for several hundred years, making it impossible for anyone to find him.
Kael had no interest in playing hide-and-seek with this guy.
Furthermore, he needed Kibutsuji Muzan to serve as nourishment for him.
Despite Kael being at the most powerful stage of his life right now, it was also his weakest moment.
Mainly because he was hungry.
Endless hot light now released from Kael's body, transforming into a furnace that was tangible but without substance.
This was power derived from the "Sun"; as its sole representative on earth, borrowing it was no problem.
The remaining demons in the Infinity Castle, the moment they were placed in this furnace of light and heat, turned to ash and became fuel for Kael.
However, these were all insignificant "small matches"; the largest one was still struggling to escape.
Kibutsuji Muzan didn't dare to look back even once; just the light touching its body caused it to disintegrate uncontrollably, as if it were bathing in high noon sunlight.
Of the 1,800 fragments, most disappeared in the blink of an eye.
Splitting itself undoubtedly weakened Kibutsuji Muzan's resistance to the sun, but it had no choice right now; if it didn't split in all directions, Kael would really catch up.
"I don't want to die... I absolutely won't die... won't..."
Kibutsuji Muzan's determined will and fear of death actually allowed a portion of its fragments to endure the sunlight and burrow towards the ground.
Witnessing this, Kael raised his hand and gripped, and the radiating light rays condensed and solidified in his hand; looking from afar, it was as if a fragment had fallen from the sun high in the sky.
The light spear fell like a meteor hitting the ground, and the earth instantly turned into lava.
Kael could no longer perceive Kibutsuji Muzan's existence; its soul had also been wiped clean.
"Did I use too much force?"
Kael looked at the result of his creation and muttered to himself.
This could only be described as a bit of an apology.
It was his first time acting as a spokesperson for the sun, so he was still a bit unaccustomed to it.
"Kael?"
A cautious voice came from behind him.
Shinobu Kocho looked at the somewhat unfamiliar being before her, finding it truly difficult to connect him with the Kael in her memory; that aura that made one want to worship and bow down was like a god of the high heavens.
You couldn't even look directly at Kael's face; doing so would cause a strong sense of dizziness and panic.
Originally, Shinobu Kocho had never believed in gods; if they really existed, how could demons have been born? But at this moment, she began to question her long-held beliefs.
"You're here."
Kael looked back and noticed the wrong expressions on Shinobu Kocho and the others' faces. He looked down at his still "glowing" body and added a word of comfort.
"Don't be nervous, I'll be able to control it after I adapt for a while."
Hearing this familiar tone, Shinobu Kocho and the others secretly breathed a sigh of relief, shifted their attention back to their original destination, and looked around, inquiring.
"Where is Kibutsuji Muzan?"
"I'm like this now; of course he's gone."
Kael's tone was calm, as if he had done something insignificant.
"Has it ended just like this?"
Shinobu Kocho felt as if she were in a dream, but following closely behind was a faint sense of emptiness, like suddenly dropping a heavy responsibility and being unable to find a future direction in life for a moment.
"This guy, he couldn't have really become a god, could he? Does that mean I can't secretly curse him in private anymore?"
Sanemi Shinazugawa whispered under his breath.
"That's right, insulting a god will land you in the Hell of Tongue-Pulling."
Kael's voice drifted eerily into Sanemi Shinazugawa's ears, scaring him so much he almost broke into a cold sweat. He said with a trembling mouth,
"I... I've killed so many demons after all..."
"I'm sorry, as you know, I'm a petty person."
Kael interrupted with a beaming smile.
"..."
Sanemi Shinazugawa felt like the sky was falling.
He hadn't believed in things like hell before, but now that a god of the high heavens had appeared, he naturally had no choice but to believe it.
No, I still want to see my departed family again.
"Kael, are you really a god?"
Shinobu Kocho asked softly, her voice carrying some worry and fear. What she was afraid of was different from Sanemi Shinazugawa; she was afraid Kael would return to the high heavens.
Tricked me out of my body and now you want to run?
Don't even think about it.
Kael would have to cry out in injustice at this; he was clearly the one who was pushed down, so how could it be called trickery?
"If I am, then can I marry three thousand wives?"
Kael asked in return.
"No!!"
Shinobu Kocho's gaze suddenly became dangerous.
"Then how about two thousand nine hundred and ninety-nine?"
Kael was still trying to negotiate; he felt that his kidneys could definitely withstand such pressure now, he believed in himself.
"Three at most!"
Shinobu Kocho couldn't help but grip her blade. Her name contained the character for 'endurance,' but that didn't mean she could endure everything.
"Okay, okay."
Kael raised his hands in surrender, feeling secretly regretful.
He hadn't even been able to open a gap, so it seemed impossible in the future. To my two thousand nine hundred and ninety-seven wives who haven't crossed the threshold yet, I'm sorry; I probably won't be able to give you a status in the future.
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