Why?
Before this, Mahito didn't know, but after fighting Ryomen Sukuna, Mahito finally understood why:
Because of the open-type Domain Expansion!
Ashiya Magon once said that the true reason an open-type Domain Expansion forms is that Ryomen Sukuna views the entire world as his dining hall.
In this dining hall, all living beings are his food.
No one beside him is qualified to sit at the same table.
His willpower transcends the entire world, which is why he can use an open-type Domain Expansion.
In the original work, someone once evaluated Ryomen Sukuna this way:
He is an extremely egoistic person.
In terms of egoism alone, no one in the world can compare to Ryomen Sukuna.
It's not that Ryomen Sukuna doesn't understand compassion or lacks empathy.
Quite the opposite.
In the final battle, he specifically explained his understanding of love.
Though it was twisted logic, it was internally consistent.
And in the final space after death, when he spoke with the original Mahito, he also said he had two chances to change his current path.
One could say he isn't someone devoid of emotion.
But this is actually even more terrifying!
Because while possessing healthy emotions, he completely accepted his ability to do whatever he wanted in this world without a shred of remorse.
He engraved complete egoism and complete selfishness into his soul, unshakable until death.
Only a true monster like this, who has completely discarded all humanity on a spiritual level, can use an open-type Domain Expansion!
This is the real reason why Gojo Satoru, even after seeing and recognizing the open-type Domain Expansion, still couldn't use it.
One must realize that in the final Domain battle between Gojo Satoru and Ryomen Sukuna, Gojo's Domain Expansion barrier was evaluated by others as "completely incomprehensible."
This evaluation was on the same level as Ryomen Sukuna's open-type Domain Expansion.
Because Gojo Satoru indeed still has humanity.
He cannot be as completely selfish and egoistic as Ryomen Sukuna.
Therefore, Gojo cannot achieve an open-type Domain Expansion.
And in the entire work, besides Ryomen Sukuna, there is one other person with an open-type Domain Expansion:
Kenjaku.
His mental state is, in fact, the same as Ryomen Sukuna's!
That's why he can use an open-type Domain Expansion.
Because of this, Tengen, who clearly knew the reason for the formation of open-type Domain Expansions, never considered the reason why Kenjaku could use one.
A bastard like this, completely devoid of humanity, should be tortured forever.
Even death would be a mercy to him!
This was the sentence Mahito passed on him.
"I can engrave the outlines of others' souls into my own Innate Domain," Kenjaku explained with a beaming smile, hands raised.
"Mahito, I've had too much contact with you."
"I can also engrave the outline of your soul, and because of that, I can simulate your thinking to a limited degree."
"Although it's far inferior to your simulated soul, if I wanted to, I could even use your Idle Transfiguration through a Binding Vow."
Mahito's thoughts raced, and he suddenly had an epiphany.
"That's it!"
"That's how you were able to give birth to Itadori Yuji!"
"And that's how you can replicate Cursed Techniques!"
In the original work, Kenjaku once used a third, different Cursed Technique besides his body's technique and his own technique.
His own Brain Exchange Technique, the body's Cursed Spirit Manipulation, and Itadori Yuji's mother's Anti-Gravity System.
According to Yuki Tsukumo's judgment in the original work, Kenjaku could engrave three to four techniques in his brain, but this was limited to Kenjaku himself.
Others, including Yuta Okkotsu when he personally used the Brain Exchange Technique to inhabit Gojo Satoru's body after Gojo's death, could not do it.
In fact, after using the Brain Exchange Technique, Yuta Okkotsu couldn't even use his own Copy Technique.
He could only use Gojo Satoru's Limitless and Six Eyes.
Even after activating Domain Expansion, Okkotsu didn't use his own Domain Expansion: Authentic Mutual Love, but rather Gojo's Domain Expansion: Unlimited Void.
Why?
The reason lies in Kenjaku's Innate Domain!
Kenjaku's Innate Domain is a very special one capable of replicating souls.
His Domain Expansion: Womb Profusion contains a pillar of flesh with countless human faces.
That isn't meaningless.
It symbolizes the countless replicated souls!
Kenjaku was puzzled.
"Didn't you know this already?"
"Didn't we discuss this before?"
In the original work, there was a time when Ryomen Sukuna was chatting with Kenjaku.
At that time, Ryomen Sukuna said of Itadori Yuji:
"I suspect Kenjaku's spouse was the reincarnation of my twin brother, so he can be understood as having the same soul as me."
Furthermore:
"I was originally supposed to be born as one of twins, but while our mother was pregnant, she must have been suffering from starvation."
"So, in order to obtain energy, I absorbed my twin brother before birth."
"That guy's soul went through countless reincarnations and ended up entangled with Kenjaku."
But there's a problem.
Even at the end of this chat, the conclusion Ryomen Sukuna reached was only a hypothesis.
He said:
"As you know, Itadori Yuji, as a player in the Culling Game, was born with Sukuna's finger sealed inside him. To ensure the strength of the vessel, it had to be done this way."
This actually explained that Itadori Yuji's soul is almost identical to Ryomen Sukuna's.
But at the same time, Kenjaku didn't use the soul of Ryomen Sukuna's brother.
Itadori Yuji's father was Ryomen Sukuna's true brother.
How did Kenjaku do it?
Ryomen Sukuna's hypothesis actually revealed it.
Even without Sukuna's finger inside him, Itadori Yuji's body was essentially one that naturally sealed Sukuna's finger.
In other words, his body was Sukuna's body.
The logic isn't hard to grasp.
If it's a body that naturally comes with the seal for Sukuna's finger, doesn't that prove Itadori Yuji's body is Sukuna's body?
The ability Kenjaku spoke of truly explained everything.
His Innate Domain can replicate souls!
Through the most intimate physical acts with the reincarnation of Sukuna's brother, Kenjaku replicated the brother's soul.
(T/N: He really got cracked for his plan. At some point you just have to respect the hustle.)
Through this soul, Kenjaku reverse-engineered Sukuna's body and then gave birth to it through his own body.
This is the truth behind Itadori Yuji!
"I just suspected that you always held something back when we discussed things before, and I couldn't figure it out."
"See? You really did hold back until now."
Mahito laughed.
"Kenjaku, I never knew your Innate Domain could replicate souls."
"This must be your core secret."
This also explained why Kenjaku, despite not being as egoistic as Ryomen Sukuna, could still use an open-type Domain Expansion:
He was truly mad!
He replicated the souls of everyone he saw into his Innate Domain, with all their thoughts entangled together—gentleness and cruelty, optimism and pessimism, longing and despair.
How could he not be mad?
In the original work, Kenjaku once showed a motherly, gentle expression toward Itadori Yuji, only to discard him in the next instant.
This behavior, which could be called schizophrenic, now had an explanation:
He truly possessed a mother's gentleness and also a cold-blooded cruelty.
Both thoughts existed simultaneously and were integrated by Kenjaku amidst their conflict.
Only a madman like this could use an open-type Domain Expansion!
Kenjaku sighed.
"Fine, I did indeed make quite a few small moves."
"That's why I've come to seek a way to live."
"Mahito, I am no match for you regardless."
"Why not put me into the Dream Walk Migration to seek survival?"
"I swear that even if I win, I will never use it to disrupt your Apotheosis Ritual."
"I can set a Binding Vow."
"Faced with the temptation of becoming a god, even a Binding Vow isn't safe, because a god's computational power can maximize the avoidance of a Binding Vow's negative effects," Mahito rejected.
"I thought you would understand that logic better than I do."
Kenjaku suddenly said,
"My target is Takaba Fumihiko."
"I hope to obtain his Cursed Technique."
"At the same time, I obtain his technique, I will directly exit the Dream Walk Migration."
"Since this Binding Vow must be fulfilled before the final moment of your Apotheosis Ritual, the Binding Vow will still be effective against me."
"How about it?"
Mahito said with interest,
"It sounds like Takaba Fumihiko's Cursed Technique could allow you to avoid the new life I've granted you?"
What kind of "new life" is that?!
Kenjaku's mouth twitched.
"I just want to try," Kenjaku said seriously.
"Besides, since my Binding Vow has no impact on your becoming a god, my entry into the Dream Walk Migration only benefits you."
"My Cursed Energy residue, my Cursed Techniques, all my knowledge and experience will be replicated by your Dharma Realm Reincarnation Nirvana Realm."
"You should be very happy too, right?"
"But the price is my lack of peace of mind."
"You might actually be able to escape the new life I've given you using Takaba Fumihiko's technique, and that would make me very unhappy," Mahito said cheerfully.
"Just the thought of you bastard still being at large makes me exceptionally displeased."
"I'd rather not have your knowledge and skills and instead have you live the new life I've given you."
"I don't remember you being such a childish person."
"That's because before then, I couldn't afford to be childish," Mahito said matter-of-factly.
"But now, I can be as childish as I want."
"This is true freedom."
To hell with your freedom!
Kenjaku was speechless.
"However, I still agree," Mahito suddenly laughed.
Kenjaku didn't feel happy.
Quite the opposite.
His scalp tingled.
He pulled back his smile and asked,
"Why?"
"Did you forget?"
"I just said I prepared a secret weapon specifically for you," Mahito said meaningfully.
"I thought I'd have to wait until I became a god to have this joy."
"Since you want to jump in yourself, I can only express with even more joy:
This is just wonderful!"
Kenjaku's heart raced.
A massive sense of dread slowly enveloped him, yet he knew nothing of the truth behind this fear.
"...That secret weapon, who exactly is it?"
Kenjaku wondered.
"Could it be Tengen?"
"But Tengen has already gone to America."
Mahito said with a beaming smile,
"Why don't you... guess?"
Kenjaku was wooden.
To hell with your freedom!
Kenjaku was completely speechless.
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