Eichi's external Technique, the Holy Grail, originated from the Type-Moon world.
Legend has it that the Holy Grail is an omnipotent wish-granting machine capable of fulfilling all desires.
However, like most legends, the Holy Grail is not omnipotent.
In fact, not long after rumors of the Holy Grail in Fuyuki City emerged, the Holy Church investigated it.
Subsequently, the Holy Church defined it as a fake.
Meaning, this Holy Grail is a fake, everyone, don't be fooled.
So, why is the Holy Grail called an omnipotent wish-granting machine?
Because for most people, the Holy Grail can truly grant wishes.
However, the method for fulfilling these wishes requires you to provide it.
The Holy Grail's way of granting wishes is through the Third Law, Soul Materialization.
Its essence is something containing the Third Law, with immense Cursed Energy resources.
Just like Shirou Amakusa Tokisada wished to save all humanity with the Third Law, the Holy Grail responded to his wish.
Anima Animusphere, the founder of Chaldea, successfully wished for a massive amount of money.
But Emiya Kiritsugu could not; the wish he made to the Holy Grail, 'world peace, no strife among humans,' was something even he didn't know how to achieve.
So, even if the Holy Grail hadn't been corrupted, Emiya Kiritsugu's wish would not have been granted.
But for most people, the Holy Grail is indeed an omnipotent wish-granting machine.
I wish to use the Third Law to materialize a large amount of money for me, and then summon a wife for me.
Is there a problem with that?
There is no problem.
Moreover, if you have any insoluble problems, you can also ask the Holy Grail to summon a Servant to help you solve them.
It's just that summoning a Servant consumes a huge amount of Cursed Energy, and you might have to accumulate Cursed Energy for a long time, like in the Type-Moon story, to use it once.
However, Eichi doesn't have that many ideas at the moment.
This time, the wish Eichi wants to make to the Holy Grail is very simple.
With the help of the Third Law, explore his Soul and body, and understand the essence of the Ten Shadows Technique.
Where exactly does Jujutsu exist?
Initially, Eichi thought it was the brain, but Kenjaku aside, where did Sukuna get a brain from, relying only on fingers?
And there are also people like Yoshino Junpei who possess Cursed Energy and Jujutsu, but cannot use Jujutsu due to their brain structure.
Furthermore, Sukuna once said to Yuji Itadori in the Juvenile Detention Center:
"Even if I die in your body, there are still 18 of my Soul Clones outside..."
Based on this, Eichi speculates that the origin of Jujutsu may be related to the Soul.
Sukuna's fingers are merely vessels carrying his Soul and Cursed Energy.
The words "Soul" in the Third Law's Soul Materialization also indicate the Third Law's profound understanding of the Soul.
If one does not understand the Soul, how can one materialize it?
So Eichi decided to make a wish to the Holy Grail, asking it to help him explore his Soul.
"Are you ready, Eichi?"
It was Medea who spoke.
She was responsible for the preparations and safeguards for this wish.
"Let's begin, Medea."
A golden cup appeared in Eichi's hand.
Since it is an external Technique, the Holy Grail can also be taken out of the body.
The golden cup was placed in the center of Medea's magic circle.
This was a magic circle Medea meticulously prepared to monitor the Holy Grail's operation and Eichi's condition.
If anything went wrong with either the Holy Grail or Eichi, Medea would immediately intervene.
Eichi lay on the ground, slowly falling into a deep sleep, his consciousness becoming increasingly blurred.
Gradually, Eichi felt a viscous sensation all around him.
It was as if he had sunk into a swamp.
Eichi felt the immense resistance as he moved his arm, his heart filled with doubt.
Soon, Eichi saw clearly what was around him.
Eichi seemed to be in a dark sea, every movement met with resistance similar to seawater.
The only light source in the entire world was a humanoid silhouette somewhere far above.
'Is that my body?'
Eichi laboriously raised his hand.
Indeed, his arm in his vision became ethereal and unreal.
After an unknown period of sinking, Eichi felt a peculiar light coming from below.
It was the same kind of light as the Sword of Exorcism emanating positive energy from Mahoraga's hand.
Eichi turned around, and a peculiar magic circle appeared in his line of sight.
Mahoraga stood in the center of the magic circle.
Like a tall stone statue.
Beneath Mahoraga's feet was a giant Eight-Handed Sword pattern.
With Mahoraga at the center, the magic circle extended nine lines outwards.
At the end of each line was a Shikigami.
Only one of the Shikigami had already dissipated.
Eichi came to the Black Divine Dog's side, looking at the Foot Jade beneath Black Divine Dog's feet, and the Dao Reversal Jade representing Shiro next to it.
Only the Dao Reversal Jade pattern was already blurry.
Eichi reached out to touch the blurry Dao Reversal Jade pattern.
Then he carefully perceived the Ten Shadows Technique's magic circle.
Under the Holy Grail's blessing, Eichi's Soul Power grew stronger and stronger, and his perception became increasingly acute.
Soon, a wonderful sensation came from the magic circle.
This magic circle seemed to be connected to something deeper.
Eichi spread his arms and lay down at Mahoraga's feet, which was the exact center of the Ten Shadows Technique's magic circle.
The Holy Grail's power continuously blessed Eichi's Soul, and gradually, Eichi felt himself sinking into another world.
The light above his head disappeared.
That was a manifestation of Eichi's Soul leaving his physical body.
In reality, Medea, realizing Eichi's Soul was drifting further and further away, immediately prepared to recall Eichi's Soul at any moment.
Eichi felt as if he had slept.
After waking up, he seemed to have Transmigrated again.
Eichi opened his eyes and looked around.
Colorful black.
This was Eichi's first reaction.
Eichi's Soul drifted in this peculiar world.
Just like the scene people see on the water's surface, everything here was inverted compared to the real world.
And the light here was black.
Eichi's Soul was observing this magical world.
Soul vision different from the naked eye, a Shadow World different from reality.
All of this made Eichi feel incredibly novel.
Soon, Eichi found the thing in this world that connected with his Soul.
It was a giant magic circle, and also the origin of the Ten Shadows Technique.
This magic circle leaves its projection in the Soul of every Ten Shadows Technique user, allowing them to use the power of the Shadow Shikigami.
As he approached the magic circle, Eichi noticed pairs of eyes lighting up in the Shadow World.
All these eyes were staring at Eichi, this strange intruder.
'Shadow beings?'
Eichi saw creatures resembling Jade Hounds and giant snakes among them.
Eichi remained vigilant while his Soul drifted towards the magic circle.
The Ten Shadows Technique's magic circle also responded to Eichi.
The shadow beings retreated, and Eichi placed his hand on the magic circle.
Shadow Cursed Energy flowed from the magic circle into Eichi's Soul.
Eichi's Soul felt a sensation similar to itching.
Eichi was pleasantly surprised to find that the projection of the Ten Shadows Technique's magic circle in his Soul had been repaired.
Shiro, who was sunbathing in the yard, seemed to sense something and suddenly perked up his ears.
Because his strength couldn't keep up, Shiro had now become the High School's mascot, securing a gatekeeper position at the High School.
The next moment, Shiro transformed into a ray of light and flew into Eichi's Soul, leaving only a golden chess piece in its place.
Gurgle, gurgle.
"The shadow is moving?"
Medea looked at the shadow beneath Eichi.
Sounds continuously emanated from within the shadow.
"This is bad."
Medea immediately released a barrier, protecting everything in the room.
Boom.
Eichi's shadow surged like a flood, engulfing the entire barrier.
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