The Mahito wasn't crazy, because he genuinely had the idea and the strength to challenge Gojo Satoru.
He had now obtained a body, but it was an unrefined incarnation, and the degree of compatibility with him was insufficient, so the synchronization rate could not reach 100%.
In this regard, Uraume was the true Great Master; all Ancient Sorcerers who signed a Binding Vow with Kenjaku used incarnation bodies specially prepared by Kenjaku.
These special incarnation bodies could even perfectly unleash the Ancient Sorcerers' strength from before their deaths.
However, the Sorcerer whose body the Mahito currently incarnated was not carefully prepared, but rather one Kenjaku had grabbed at random.
The difference was immense.
Cursed object incarnation was actually simpler than imagined.
Taking a Special Grade cursed object like the Cursed Womb: Death Paintings as an example, it only needed to be placed into an ordinary person's belly.
After that, the ordinary person's body would complete the incarnation due to the infection of the Curse.
If the Mahito wished, he could certainly do the same.
In fact, his current incarnation body was similar to this.
He only cared about the 'Construction Technique'; as long as the Cursed Technique of the incarnation body was satisfactory, nothing else mattered.
But in reality, this kind of incarnation was very crude.
Kenjaku had a lot to say about this.
Over a thousand years, he had continuously collected Binding Vows from powerful Sorcerers.
After these powerful Sorcerers died, Kenjaku made them into cursed objects.
But Kenjaku did not casually put them into ordinary people's mouths to incarnate them.
On the contrary, he carefully selected suitable vessels and spent several years refining their bodies until the game began, allowing all Ancient Sorcerers to revive in their peak state.
Hmm, the Mahito would only realize later that things weren't that simple.
Kenjaku was far more insidious than the Mahito imagined, with methods so superb that the Mahito's current imagination couldn't even grasp them.
This was especially true for Ryomen Sukuna.
To create an incarnation body that could allow Ryomen Sukuna to unleash his full power, he personally took on the role, transformed into a woman, and personally gave birth to a child.
This child was Itadori Yuji, the protagonist of Jujutsu Kaisen.
Itadori Yuji also played his role well.
He broke the pattern of incarnation bodies that had never appeared since the emergence of the Special Grade cursed object, "Ryomen Sukuna's Fingers," becoming Ryomen Sukuna's incarnation body, which was also the main storyline of the original story until the end.
The Mahito had an idea, an idea similar to Kenjaku's: to possess an incarnation body that was 100% compatible.
If he could achieve this, he was confident that he could truly challenge Gojo Satoru.
He told Kenjaku his idea, hoping to gain the approval of this thousand-year-old Sorcerer.
Kenjaku, dragging his shattered body, lay on a beach chair, carefully pondering the Mahito's ingenious idea.
He asked, "You are a Cursed Spirit in the domain of the soul."
"Even after a thousand years, my understanding of the soul is far inferior to yours."
"So I ask you, what do you think the soul is?"
This was a conversation three days after that question-and-answer session.
The Mahito, like Kenjaku, lay on a beach chair, and upon hearing the question, he couldn't help but fall into deep thought.
This was a good question, because before this, he had never seriously considered it.
Although due to his previous life, he still had a filter regarding the soul, after transmigrating into the Mahito's body, this filter had almost vanished.
Body and soul were the same to him; due to his ability, he even felt that the soul was easier to modify than the body.
He cautiously said, "A component of human action?"
Kenjaku did not deny it.
He brought up a philosophical idea: "A Western philosopher proposed an interesting idea."
"He said that if there was a ship that, during its voyage, constantly wore down its components, requiring frequent replacement, until eventually, even the most important keel was replaced, then, is this ship still the original ship?"
To be honest, the Mahito didn't understand what Kenjaku was talking about.
What did this have to do with his incarnation?
The question he asked didn't even touch upon the domain of the soul, only the domain of incarnation.
The Mahito thought Kenjaku would talk about incarnation-related matters as usual, never expecting him to discuss matters related to the soul, and even involving a philosophical idea.
Kenjaku's lips curved upwards.
Every time he saw this arrogant King of Curses show a bewildered expression, it made him happy.
He clearly knew that as time passed, the Mahito's physical performance and wisdom would only become more perfect, until eventually, even he wouldn't be able to teach him.
On the contrary, in the future, he would be the one needing to seek guidance.
Therefore, while the Mahito had not yet fully matured, this time spent as a mentor only made him cherish it more.
Kenjaku pointed to the brain: "According to modern medical explanations, the most important component of the human body is the brain, because human memory and sensation ultimately reside in the brain."
"I ask you, Mahito, does the human soul also reside in the brain?"
"No," the Mahito said definitively.
"Where then?" Kenjaku asked.
The Mahito pointed to his heart: "Here."
Kenjaku knew that although the Mahito was pointing to the heart, it didn't actually mean that the soul resided in the human heart.
Sure enough, the Mahito said, "The position of the soul completely overlaps with the body."
"The soul exists in every part of the body."
"They are two sides of the same coin, inseparable."
This was also why whenever the Mahito used Idle Transfiguration to reshape the soul, the body would be pulled along by the soul, because the soul was a part of the body; moving one part affected the whole.
Humans can see the body with their eyes but not the soul, so they mistakenly believe the soul is nobler than the body.
In fact, the opposite is true.
The soul is very ordinary, so ordinary that it is one with the body.
Cutting off a part of the body is, to some extent, no different from cutting off a part of the soul.
Kenjaku nodded: "Returning to the previous question, which component on that ship do you think is the soul?"
"Don't misunderstand, although this is a philosophical deliberation, we are not discussing a philosophical problem, but a practical one."
"Don't treat it as philosophy; treat it as medicine."
Treat it as medicine?
If this philosophical question was delved into, would it also relate to the soul?
The Mahito thought seriously, then said hesitantly, "It should all be related."
Kenjaku looked deeply at the Mahito and smiled: "No need to be so hesitant, Mahito."
"As I said, in the research of the soul's domain, you are definitely above me."
"I will listen carefully to all your conclusions."
"You just said 'all,' right?"
"Then, let's discuss it from the perspective of 'all.'"
The Mahito secretly sighed that his theories in this area were indeed too few, and he was being led by Kenjaku.
But he couldn't be blamed, because he simply didn't have the means to learn, and could only rely on Kenjaku.
Fortunately, because of the Binding Vow, the knowledge Kenjaku provided would certainly be correct—at least what he himself believed to be correct.
He asked, "What was the answer you originally intended to give?"
"It's humanity," Kenjaku maintained his unchanging smile.
"The soul should refer to the driver on that constantly replaced ship—no matter how many times the ship's components are replaced, only the driver remains unchanged."
"The ship's soul is neither the keel symbolizing the 'heart' nor the steering wheel symbolizing the 'brain,' but the person holding the steering wheel."
The Mahito suddenly understood.
This was indeed a very Kenjaku-esque answer, because that's how he himself operated.
Kenjaku's tone shifted: "However, since it comes from the Mahito, a Great Master in the soul's domain, perhaps you are the correct one."
"'Body and soul as one' is the true answer."
"Hmm, sometimes I also feel faint fluctuations of the original consciousness of the incarnation body."
"I originally thought it was a coincidence, but if your theory of 'body and soul as one' is correct, then it shouldn't be a coincidence, but rather, 'as long as this shell is used, the backlash from the shell's owner's soul is unavoidable.'"
This was Kenjaku's own problem, which he didn't elaborate on, instead returning to the previous topic.
"For you to create your own incarnation, the primary condition for a breakthrough is to prepare the location where your soul will reside."
"Unlike ordinary incarnations, this is the most crucial point for a specialized incarnation, because the compatibility with the cursed object needs to be adjusted to 100%."
"Therefore, its soul must also be changed, just like that thin ship."
Adjusting the compatibility between the soul and the body.
The Mahito pondered.
Kenjaku said with a smile, "The most compatible method, without a doubt, is to be reborn, which is transmigration."
The Mahito frowned, "Transmigration?"
"Do you know how I arranged Ryomen Sukuna's incarnation body?" Kenjaku asked.
This was indeed something the original work never seemed to mention, and the Mahito was also very curious: "Please tell me."
"I placed the transmigrated soul of Ryomen Sukuna's brother into the womb of my previous body to grow naturally," Kenjaku said without changing his expression.
The Mahito was stunned.
Did the original work ever say this?
"Few people know that Ryomen Sukuna actually had a brother," Kenjaku's lips curled up, a look that was either mocking or sad.
He continued, "However, Ryomen Sukuna's twin brother was never born."
"While Ryomen Sukuna and his twin brother were in their mother's womb, Ryomen Sukuna actively devoured his twin brother."
The Mahito felt a chill down his spine.
A monster that would actively prey on its own direct kin before even being born—that was the King of Curses from a thousand years ago, Ryomen Sukuna.
"This is the best, highest, most perfect incarnation body," Kenjaku stared at the Mahito, speaking in a voice as light and ethereal as willow catkins.
"Mahito, for you to create your own incarnation body, you must also adhere to this special rule: place the transmigrated body of a part of your own soul into a human mother's womb, watch it grow, and then—devour your other half to become the master of the body."
Even though the Mahito had been a Cursed Spirit for a month and a half, he still found this method too perverse and against human morality.
He couldn't help but feel a sudden doubt in his heart, and asked curiously, "Are the Ancient Sorcerer incarnation bodies you prepared also made this way?"
"Of course not..." Kenjaku was about to continue, but suddenly stopped.
"You already know about the Binding Vow I made with the Ancient Sorcerers?"
"You even know that I've prepared incarnation bodies for Ancient Sorcerers?"
"How did you find out?"
"I have my own information channels, you know," the Mahito said nonchalantly.
"After all, as the creator, even if they're unwilling, those creations will still share information with me."
Kenjaku asked hesitantly, "Are they those modified Shell Spirits?"
"They actually took the initiative to investigate my affairs? Even though you didn't give the order?"