Fuyuki City is both big and small.

Although the entirety of Fuyuki City spans 557.02 square kilometers and has a population of over a million, in our country, its land area would at most be considered a small county town.

Since Chen Yu could encounter Kirei Kotomine at Hongzhou Yan Sui Guan · Taishan, it was only natural to encounter Zouken Matou in the Great Cavern of Mount Enzou.

Chen Yu had a very poor impression of Zouken Matou.

Whether it was the inhumane acts he committed against Sakura, or his dark, humble, cunning, and cruel personality after his soul decayed, Chen Yu disliked him greatly.

Looking at the strangely shaped Zouken Matou, Chen Yu scrutinized him, wondering if a single Killing Curse could kill this old man who had lived for over five hundred years.

This old man had abandoned his original body, instead controlling magic-infused worms to form a new body for himself, which he used to move about, by possessing them with his soul.

His Killing Curse happened to target the soul, and he was curious if he could eliminate this old worm right here.

Chen Yu took out his wand from his backpack, not answering Zouken Matou's question, but instead saying to him, "Who do I have here? Why, it's Zouken Matou, the old immortal of the Matou Family, one of The Three Families who designed this Holy Grail War. Or should I call you by your other name—Makiri Zolgen? This five-hundred-year-long obsession, it seems time has not only twisted your body but also your soul!"

When Chen Yu uttered the name Makiri Zolgen, the pupils in Zouken Matou's sunken eyes suddenly constricted, shocked that Chen Yu knew his true name.

Even in the Clock Tower, the headquarters of Magi, very few people knew the name Makiri Zolgen.

Five hundred years were enough to erase much history, including the name Makiri Zolgen.

Five hundred years ago, Makiri Zolgen was still a so-called "ally of justice," with the ideal of "abolishing all evil," or rather, to eradicate the "karma" held by humanity.

But after Makiri Zolgen realized that he could not achieve his ideal alone, he hoped to use the Third Magic to evolve humanity into new humans with a broader spirituality, thereby ridding them of their evil nature.

Makiri Zolgen, embracing the noble ideal of "eradicating human evil," placed his hopes on the Einzbern's "Third Magic" and cooperated with them. To avoid the Holy Church's surveillance of Magi, "Makiri Zolgen" and "Justeaze Lizrich von Einzbern," as Western Magi, set foot on the island nation's soil.

But humans have their limits, and five hundred years is simply too long for a human being.

He had lived too long; five hundred years had long since overwhelmed his soul.

At some point, the first head of the Matou Family, Zouken Matou, who had once been able to uphold his original intentions, lost his initial resolve over the long years and became unscrupulous.

Perhaps from the moment the Winter Saint died, the former Zouken Matou had already begun to die.

When hope and despair intertwined.

Noble ideals decayed into obligations, eventually transforming into base obsessions.

To prolong his life, he even abandoned his original human body, using ordinary humans as worm-beds to cultivate and manipulate magic-infused worms to form new, temporary bodies.

A twisted body can only create a twisted soul. This act of prolonging life by "turning oneself into a worm" and "parasitizing others" completely eroded Zouken Matou's soul, turning it into a collection of obsessions.

The original worm magic was once an elegant magic, like the metamorphosis of a butterfly, but with Zouken Matou's continuous modifications, it has now degenerated into a detestable magic that controls flesh-eating worms.

Even though Chen Yu called out his former name, it didn't make him recall his past noble goals; instead, he felt a surge of anger as if his identity had been stripped bare.

"Don't get too smug! No matter if you got this information from the Clock Tower, the Holy Church, or some other secret means, you're still too naive to try and shake my resolve with flowery words!"

Zouken Matou tapped his staff lightly on the ground, and instantly, countless "buzzing" sounds filled the air.

Hundreds of flying insects emerged from the bushes, circling around Zouken Matou, awaiting his command.

"There was once a man with great ambitions, but the torrent of time transformed everything about that man into a monstrosity, whether it was his appearance, his soul, or his ambitions."

"Originally, I had planned to show some respect to the person who designed the Holy Grail system, but now it seems unnecessary. To go to such lengths to extend your life with such ugly magic, if your past self saw your current self, you would surely regret it!"

Chen Yu raised his hand and said to Nyarlathotep, "Nyarlathotep, strike!"

"Yes, Darling!"

Nyarlathotep wielded the Whip of Departure in her hand, tearing open a purple spatial rift: "Little Darlings, dinner time!"

From the spatial rift surged hundreds of otherworldly bee swarms, pouncing towards Zouken Matou.

"Hehehe, is Caster also a worm user? This is truly too interesting! I'm starting to get curious about your true identity, Caster."

Watching the otherworldly bee swarm summoned by Nyarlathotep, Zouken Matou let out a gloomy, strange laugh.

Even though the otherworldly bee swarm was overwhelmingly defeating the winged blade worms he had summoned, he didn't feel the slightest regret.

These winged blade worms could all be cultivated and bred. As long as he could obtain some information about the Servant, even if all the worms he brought with him died, it would be an acceptable outcome.

"Avada Kedavra!"

Taking advantage of Zouken Matou's distraction, Chen Yu raised his hand and cast a Killing Curse.

The green light transformed into a lightning bolt, directly hitting Zouken Matou's body.

Zouken Matou fell to the ground, dissolving into a puddle of rotting worms.

"I'm not so foolish as to engage in a direct confrontation with a Servant, let alone a magical duel with Caster personally." Zouken Matou's sinister voice echoed through the forest. "Since you want to seize the greater grail, then go ahead, but don't think you have victory in your grasp. A Caster who controls worms, and a Master who casts soul-targeting magic... Hehehe..."

Zouken Matou's laughter faded into the distance, eventually disappearing from the land, as if he had truly left.

"Tsk, what a pity, the opponent got away."

A single Killing Curse did not kill Zouken Matou's soul, or rather, the real Zouken Matou had never come to Mount Enzou; what arrived was merely a humanoid familiar made of worms.

It seems that to truly eliminate Zouken Matou, Chen Yu would need to go to the Matou residence and destroy every single worm the old man had cultivated.

It was truly lamentable that Makiri Zolgen, who once pursued "the abolition of all evil," ultimately twisted and degenerated into an old immortal like Zouken Matou.

By the way, achieving immortality in the Type-Moon World is truly not easy.

One must not only keep their spirit uncorrupted, but also ensure their soul does not decay, their body does not perish, their freedom is not stripped away, their beliefs are not distorted, their memories are not altered, their personality is not erased, their perception is not replaced, and their senses do not fade. Achieving all of these is true immortality.

Even gaia, the will of the Earth, died once in Steel Ball Run. Achieving immortality in the Type-Moon World is simply too difficult.

"Let's go, Nyarlathotep, let's go see the greater grail!"

Confirming that Zouken Matou was no longer nearby, Chen Yu gestured for Nyarlathotep to enter the Great Cavern.

Nyarlathotep summoned the otherworldly bee swarm back into the spatial rift, and before closing the rift, one bee placed a small green particle into Nyarlathotep's hand before returning to the rift.

"Darling, Darling, Nyarlathotep did a good job, didn't she!"

After closing the spatial rift, Nyarlathotep, as if seeking praise, followed Chen Yu and extended her head in front of him, hoping Darling would reward her.

"Yes, yes, you did a good job."

Looking at Nyarlathotep, who was leaning her head in, Chen Yu could only helplessly pat her little head, giving a perfunctory reward.

Nyarlathotep, whose head had been patted by Chen Yu, happily presented Chen Yu with a green glowing gem the size of a grain of rice.

"What is this?"

"A vitality crystal extracted by the bee swarm from those worms. It's like solid honey from bees, sweet-tasting. Darling, would you like to try some?"

Looking at Nyarlathotep, who was like a child showing off a treasure, Chen Yu once again refused the food Nyarlathotep offered him.

Chen Yu had no desire to eat a vitality crystal extracted from worms.

Seeing Chen Yu shake his head in refusal, Nyarlathotep immediately popped the vitality crystal into her own mouth, muttering, "Darling is too picky," as she followed Chen Yu into the interior of the Great Cavern.

The closer they got to the greater grail, the more they could feel the immense magical power brewing within.

To clearly see the entire pattern of the Great Holy Grail Magic Array, Chen Yu had to use Lumos to illuminate the interior of the Great Cavern.

Although Chen Yu didn't understand much about magic, Nyarlathotep, as a Caster, could easily comprehend the functions and meanings of the entire Great Holy Grail Magic Array.

Nyarlathotep took a few glances and determined that the Great Holy Grail Magic Array had the function of regulating the entire Fuyuki land to make it suitable for spirit summoning, as well as the mechanism for initiating the Holy Grail War.

She could also identify the complex magic circles on the ground, indicating which lines represented drawing magical power from the land, which lines selected Masters, and which lines connected to the "Boundary Record Belt."

She even mentioned that as long as there were enough materials, a "Holy Grail War" could easily be replicated elsewhere.

Hearing Nyarlathotep speak so eloquently, explaining how to replicate the greater grail system from scratch, Chen Yu applauded Nyarlathotep.

He began to ponder whether, after learning how to build the greater grail system from Nyarlathotep, he should organize a "Holy Grail War: Goblet of Fire Edition" when he returned to The Magical World of Hogwarts during the Goblet of Fire storyline.

Three academies competing for the Goblet of Fire seemed uninteresting; it would be better to compete for a Holy Grail that could grant wishes.

Hogwarts Castle, no matter how you look at it, is a treasure trove of magic, so supporting a Holy Grail War's magical power shouldn't be a problem.

But are there Heroic Spirits in that world?

If there are no Heroic Spirits, what kind of things would be summoned through the Holy Grail system?

Just as Chen Yu was fantasizing in his mind, he saw Nyarlathotep's drool involuntarily escaping from her mouth.

Why did Nyarlathotep suddenly look so famished?

Nyarlathotep looked up at the sky above the greater grail, belatedly wiped her mouth, and helplessly explained to Chen Yu, "Darling, there's always a delicious 'feast' scent emanating from here. I can't concentrate on talking to you here."

"Feast?"

What feast???

There was nothing else in this place except dirt and a Great Magic Array.

Three question marks appeared in Chen Yu's mind.

But he quickly realized that the 'feast' Nyarlathotep was referring to, couldn't possibly be the "All the World's Evil" inside the greater grail, could it?

During the Third Holy Grail War, the Einzbern Family, in pursuit of certain victory, illegally summoned the Zoroastrian evil god, Avenger Angra Mainyu.

They thought he was a trump card, but who knew he was just an ordinary young man from a Zoroastrian village who had been wrongly labeled with the name "All the World's Evil." Aside from being specialized in killing humans, he was useless in all other aspects and was easily defeated on the fourth day.

Because Avenger's attribute was "All the World's Evil," when his soul was absorbed into the lesser grail, the greater grail was consequently polluted by All the World's Evil.

Although its appearance did not change, its essence underwent an irreversible transformation.

The original way the Holy Grail granted wishes was supposed to bypass the process and directly achieve the result with immense magical power, but the polluted Holy Grail's method became granting the wish-maker's desires through destruction and disaster.

So the deliciousness Nyarlathotep spoke of, couldn't be the black mud polluted by "All the World's Evil," could it?

"Hmm, it's definitely a 'delicious feast,' as if it contains all the sin and darkness of the entire world, slippery, bitter, and with a sweet aroma, just like..."

Nyarlathotep put her finger to her mouth, recalling how to describe the feast before her, and after a moment of thought, finally found the right adjective: "It's like dark chocolate sauce!"

As Nyarlathotep spoke, bright, sparkling light flickered in her purple eyes.

Only Nyarlathotep could refer to the black mud containing "All the World's Evil" as "chocolate sauce."

This "black mud" is poison to ordinary people, and for Servants, it can even be said to be a greater threat, a poison among poisons.

After all, "All the World's Evil" is the embodiment of the Third Magic, possessing a considerably high degree of mystery.

It has an absolute corrosive ability towards Heroic Spirits. Heroic Spirits corroded by the black mud will immediately turn dark, like Saber.

As for humans and Heroic Spirits not corrupted by the black mud, either they came into contact with a small amount of it, or their willpower was extremely strong.

The King of Heroes, for example, was showered with black mud as if he were taking a bath. Not only did he gain a physical body, but he also resurrected the deceased Kirei on the spot.

Kiritsugu, on the other hand, suffered from the curse of the black mud for the rest of his life, eventually dying in front of Shirou years later.

So, if you're not powerful, coming into contact with black mud will drive you mad, severely damage your internal organs, poison you, or cause you to be devoured from the inside out and turn dark.

If you're powerful, you can assimilate the black mud and turn it into your own ability.

Even more powerful individuals, like Kirei and Gilgamesh, open the door to a new world.

Chen Yu felt that Nyarlathotep was an incredibly powerful being, actually thinking about how to eat the "All the World's Evil" inside the greater grail.

After thinking about Nyarlathotep's true name, Chen Yu shrugged, deciding that feeding Nyarlathotep the greater grail containing "All the World's Evil" was no big deal.

Since Nyarlathotep wanted to eat, then he would let her eat.