Who let this Dementor into Hogwarts!

Chapter 438 This thing requires too much talent for humans, but it's just right for Dementors.

Let the animals fend for themselves, Cohen took out the book he had been rewarded with by the system, and went back outside from the box.

To facilitate his "evil plan" and his subsequent study plan to obtain the rewards, Cohen specially brought the Earl back to the Room of Requirement this time—and the Earl was very curious about why Cohen had been in the box for so long.

"So what did you do to that toad-like woman?" the Count asked curiously, leaning closer to Cohen. "Did you use the Crucifixion Curse? Or something like that—"

“I was originally planning to use the Cruciatus Curse at the end,” Cohen sighed. “But those pig-like monsters killed her… But it doesn’t matter, it’s over now—I need to get down to business.”

"You're not actually going to study, are you?" The Earl looked at Cohen, who had a thick book tucked under his arm, and said disbelievingly, "Don't pretend to be hardworking. I haven't seen you read a book since first grade—"

"That's because you're having wet dreams every time I read," Cohen said mercilessly. "Alright, I'm going to study now. If you want to mate with this grey owl, go to the owlhouse—Harry and the others don't allow you to do this in the common room, but that doesn't mean I'll allow you to do it here. Can't you have any boundaries, you old pervert..."

As he spoke, Cohen glanced at a gray-feathered female owl that the Earl had brought with him; it was cooing at the Earl in a rather ambiguous way.

“I don’t even wear clothes, so why would I need any boundaries?” The count turned his head and said, “You don’t understand, there’s a very stimulating feeling in front of humans—”

"Looks like you're reminiscing about the good old days when you didn't have feathers to wear," Cohen said dryly.
-
Finally, under Cohen's oppressive power, the Earl left with the grey owl and flew to the owl hut.

Cohen finally had some free time to relax in his armchair and read through the contents of "Ancient Magic".

The font inside the book looks handwritten, but Cohen had never heard of the book, so it may never have been published.

Chapter One: The Difference Between Ancient Magic and Modern Magic—

Skip.

In general, ancient magic refers to a broad category of methods that utilize a particular magical power, rather than a fixed spell.

This feels like I'm reading "Defense Against Magic Theory"...

Chapter Two: The History and Reasons for the Decline of Ancient Magic.

Bushgomen? You're not some kind of textbook, are you? Teach something more interesting—where's my curse mark? Where's my group Avada Kedavra?
Chapter Three: The Talented Individuals and Applicable Standards of Ancient Magic—

This seems somewhat necessary to look into, because I'm really not sure if I can learn this.

The study of ancient magic has extremely strict talent standards. Only wizards who can see spiral-shaped magical traces can understand, control and use abilities related to ancient magic—this talent is difficult to obtain stably through inheritance.

Currently, the only known individual who acquired the ability to use ancient magic not through normal wizarding inheritance is the medieval wizard Merlin. He was born from the union of a nightmare and a Muggle woman, which may be the direct reason for his ability to use ancient magic.

?

What kind of unofficial history is this?
Is Merlin half-human?
Can this person get into Slytherin?
However, considering that Slytherin also has some mixed-race students, this anecdote suddenly doesn't seem so absurd anymore...

However, Cohen noticed a familiar word.

The child of "nightmare".

If this unofficial history is true...

This thing is too demanding for humans, but it's just right for Dementors—but the best way is to test whether you can see the "spiral magical traces" described in the book.

Chapter 4, Location of the Ruins of the Ancient Magic Guardians.

Ancient magic often represents an uncontrollable and destructive force. Because it contains a mixture of emotions extracted from numerous lives, it is extremely prone to going out of control. This power needs to be protected, and thus, many wizards with a conscience sealed this magic in various locations...

Cohen knew this—playing more video games in his past life was the right thing to do. The main plot of "The Legacy of Hogwarts" is that the protagonist searches for these places that seal ancient magical power—but most of them are empty, and in the end only one is left underground at Hogwarts.

If the 18th-century protagonist in reality hadn't taken the evil path and monopolized everything...

It should still be somewhere underground at Hogwarts...

That would only benefit a certain little Dementor who craves power.

Cohen intends to help his predecessor complete the evil path that he never did.

The following chapters are all about methods of using and practicing ancient magic, and even include some personal experiences—as if the author of this book were a master of ancient magic…

But when Cohen closed the book and tried to find out who the author was, he saw a cursive, handwritten name on the cover.

Merlin·Ambrosius
Merlin Ambrose.

Forget about unofficial history, it's not even a proper forgery—this is clearly a book handwritten entirely in modern English, how could it possibly have been written by Merlin in the Middle Ages?
Moreover, the very first chapter is about "the differences between ancient magic and modern magic"...

Even if the system is selling counterfeit goods, at least the location of the ancient magical ruins marked on it is correct. Cohen will know the details of the exercises and usage methods once he confirms that he can see the "spiral magical traces".

The only thing to consider now is how to find it in the Hogwarts underground.

The clumsy method is to have the soul leave the body and burrow into the ground to search—but Cohen was too lazy to spend months rummaging through the ground, which would be more mentally taxing than bombing a school.

The clever way is to follow the path taken by the "fifth-grade senior" in the game, find another "secret room" in the school, and go through it to the treasure vault that stores ancient magical power.

This will take some time for Cohen, as he has almost forgotten his position.

Cohen only remembered that there was a cylindrical spiral staircase on the way there—but the most numerous type of staircase at Hogwarts is the cylindrical spiral staircase…

Perhaps wandering around the castle these days and finding familiar spots will remind me.
-
When Cohen returned to the lounge, the Gryffindor students had already finished eating and returned.

“Cohen, where have you been? I didn’t see you, so I brought you some food.” Harry pointed to the stew and steak he had rescued from the Great Hall on the table. “Everyone’s going crazy saying that Umbridge has finally revealed her monster nature—and then there’s speculation that Fudge is actually a shapeshifter too…”

“And about the Dementors… the Ministry of Magic has already released information. Tonight’s evening papers, on the first and second pages, are all about Umbridge’s dismissal and the Dementors’ sudden escape.” Hermione was still looking at the newspaper, as if trying to find something, when she suddenly let out a cold laugh. “Ha—you should hear this: ‘Recently, the Ministry of Magic has discovered unusual activity among the Dementors in Azkaban, suspected to be subversive activities by Dolores Umbridge, a shapeshifter lurking within the Ministry.’ ‘Recently—does that mean something that happened a month or two ago?’”

“I’m more concerned about who our Defense Against the Dark Arts teacher will be,” Ron speculated, making up stories from Trelawney’s dream diary. “It can’t be another Umbridge, can it? I mean, I hope the next professor isn’t sent by the Ministry of Magic… Do you think Professor Lupin can come back and teach for another year?”

“It’s not very realistic,” Cohen said. “Because of what Snape ‘let slip’, now everyone knows he’s a werewolf, and parents won’t allow him to teach students.”

(End of this chapter)