"To be honest, if you all had been a little slower in discovering the abnormality here, I would have had to consider whether to set off a signal flare to lure you to this place. After all, you are about to witness the birth of an existence that will change the world. It will probably take about one more night. How ironic. An existence that is enough to destroy the world, yet it will be born along with the dawn."
Kotomine Kirei's tone was somewhat emotional. He turned his head to look at the tall, pillar-like existence. Within the semi-transparent membrane of flesh, one eye after another was constantly twisting, surveying the surrounding world.
"But this also means that even if it is defined as an evil thing by you, it actually also yearns for the light, right? The Lord said all things are equal. As a servant of the Lord, I am having a deeper and deeper understanding of this sentence. As expected, no born thing is equal. He is just a rather special child, right?"
Kenneth looked at the giant pillar standing in this underground space, and the constantly turning eyes inside that giant pillar of flesh. No matter how you looked at it, it was like the embryo of a demon. To say that such an existence was equal to them, what a joke?!
Kenneth swore that all his professional knowledge was insufficient to describe the existence before him. He compared it with the knowledge he had obtained from books and the shadows in those illustrations from his memory. It seemed that the thing before him could overlap with any existence that had a demonic nature. Whether it was the Demon God Pillars recorded in books, an evil Buddha, or the embryo of a demon, or the formless trolls that only exist at the world's greatest depths, it seemed they could all overlap with the thing before him.
---
In the Einzbern castle, Kiritsugu, who was searching for relevant clues, finally found a book that looked like a diary. It seemed to be a record written by the previous Einzbern family's homunculus when she participated in the Holy Grail War, wanting to leave a final mark of herself.
[I've finally arrived in this city. Because of the war, this country is filled with an oppressive atmosphere. Under this consistent suppression, I'm afraid a frenzy that is difficult to suppress will soon erupt. But none of this has anything to do with us. As a small seaside city, as a small city without special resources, the impact of the war here is relatively weak. But the people here probably can't imagine that another war is about to take place right under their noses. The Holy Grail War, a battle between seven magi and seven Heroic Spirits. If the war is intense, it's very likely to destroy this city.
Because of Grandfather's arrangement, the family did not summon a Heroic Spirit from the normal seven classes this time, but summoned an Extra Class. It seems to be an inspiration gained from the war. Grandfather had me summon Avenger. It's hard to imagine that the somewhat self-deprecating boy would be the vessel of all evil in a certain religious legend.]
Upon seeing this description, Kiritsugu's fingers paused. He then frowned. He had a premonition that this notebook would tell him why the Holy Grail had changed. At the same time, this Magus Killer had not expected that all of this was very likely related to his wife's family. This slightly refreshed Kiritsugu's view of magus families once again. In order to win the Holy Grail War, to even summon the legendary evil of the world from a certain religious legend... were they not afraid of losing control?
Magi are all madmen. Kiritsugu couldn't help but think of his own father, Emiya Norikata, a Sealing Designate of the Mage's Association.
The Emiya family's magecraft was to accelerate or stop the flow of time within a Reality Marble that was not interfered with by the world. Emiya Norikata had researched it thoroughly, attempting to infinitely accelerate the flow of time in a very small barrier with almost zero resistance, and by observing the end of the universe, to reach the Root that should appear after. Although the theory itself had a good chance, it would take hundreds of years to complete the experiment. To solve the problem of lifespan, he had no choice but to start exploring the means of becoming a Dead Apostle.
What is a Dead Apostle? Most of the vampires people talk about are Dead Apostles, basically transformed from humans through certain processes. The Dead Apostles who sucked the blood of others began to feel the superiority of the act of sucking blood at some point. Strengthening their own consciousness, the Dead Apostles who broke away from the control of the True Ancestors fled into human society. In order to continue their own existence, they repeated the act of sucking blood. This was the origin of the Dead Apostles, the beginning of the vampire species transformed from humans.
Although people who become vampires through Dead Apostles can act on their own will, because they carry the blood of a vampire, their principles of action are bound by the vampire who is their blood relative, so they cannot escape from its control. Even if they attack humans and obtain blood, most of it is taken away by the vampire who is their blood relative. After getting used to decades of life in the dark, the vampire, while following its blood relative, also attacks humans to create its own servants, injecting blood into them. This can be said to be an almost infinite cycle, which will only end with the extinction of humanity. Therefore, Kiritsugu's father could be said to be touching a taboo. To even turn himself into a non-human existence to reach the Root. This was the same as the Einzbern family summoning this existence called the ultimate evil in a certain religion in order to obtain the Holy Grail, in order to obtain the Root.
(By the way, Fou is actually a vampiric species. In fact, in the Church's numbering, it is ranked first. So be glad you're seeing the form of a little white beast! Its original form is Primate Murder, Gaia's monster!)
With his own father as a comparison, the expression on Kiritsugu's face changed again and again. Looking at the diary in his hand, he didn't know if he should turn the next page. He had a premonition that the Einzbern family, who could do such a thing, had definitely caused a great disaster.
[What was somewhat beyond my imagination was that Avenger's stats were actually not high. In fact, as the progenitor of the Avenger class, according to Grandfather, this somewhat decadent big boy could even be said to be a bit weak. How could such a person be the evil of the world? I think something must have been mistaken.]
[As expected, we lost in the battle on the first day. We escaped back with all our might. In Avenger's own words, he was the weakest Heroic Spirit in the entire Throne of Heroes, just an ordinary person. He didn't have any powerful Noble Phantasms in his hands. Summoning him was a mistake, both from the perspective of whether we could win the Holy Grail War... and simply for summoning him at all.]
[On the third day, we were attacked at our doorstep. Avenger lost. That was to be expected. Avenger and I were already mentally prepared for this. I'll end today's diary entry here. Next, I will go to the Church and wait for the end of the Holy Grail War. Oh, right, it seems I haven't mentioned Avenger's name. He is—]