From Azkaban to Hogwarts.

If you rely on purebloods as your base, you have to tolerate their arrogance. How could a wizard who is so particular about bloodlines possibly respect a shop assistant?

The core members will either inherit their family fortunes and become millionaires after graduation, or they'll go to the Ministry of Magic to collect a salary without working—as shop assistants? What a joke!

'Sure enough, the Dark Lord's core base crumbled. While most of the students might not have shown such blatant discrimination in their first year, an organization where a shop assistant becomes the leader… that kind of organization can't last.'

Even in the magical world, the word "bustling" is still very useful. For a shop assistant to talk about bloodlines is simply a joke.

At first, some people might feel sorry for you, but after a while, even your underlings will stop following you, and there's no future in it!

'Voldemort is a smart man; he wouldn't be so foolish as to abandon his organization, a bunch of pure-blooded henchmen, whom he even used later…'

'The shop assistant… there must be something he desperately needs in that store!'

William speculated with absolute certainty.

“This room is basically useless except for the blackboard…” William began to check the other chairs for notes or anything, but he had already given up hope—after the Dark Lord himself left Hogwarts, this place should have been abandoned 100%.

It's likely that when the Dark Lord first discovered this place, he didn't tell anyone it was a place where requests could be fulfilled. He might even have said it was left behind by Slytherin to glorify himself—just like the Chamber of Secrets...

Shaking his head, William closed the door—he was no longer of any use, and he wouldn't need to come here until he mastered the blackboard magic Voldemort had developed.

-

"Professor, what was that just now?"

As soon as William came out, three students surrounded him—their obedience was a bit unexpected for William; if he had known this, he wouldn't have bothered to eliminate the trap.

“Oh, there,” William said, using a prepared statement. “I found the room where students used to conduct experiments in violation of regulations. I think it might not only violate school rules but also the law. I’m going to send them a letter with evidence to request a written apology, or I’ll ask Filch to help me contact the Ministry of Magic.”

The three of them were immediately stunned.

"I found it in the files. Their disciplinary violations were too outrageous. Actually, I wanted to check the current students, but I found it all at once, so I just looked for evidence to make them remember their alma mater," William explained with a smile. "The main problem is that there haven't been many students in solitary confinement lately, and Filch keeps complaining."

"By the way, you three won't tell anyone else, will you?" William smiled and gave each of them a five-second look. "Hopefully, I won't hear about it..."

"will not!"

The three of them shook their heads in unison, then made an excuse to leave.

"Good heavens, they're checking the records for violations!"

Ron complained, "What if they bring up what happened in first grade? Will we get locked up?"

“No, Dumbledore gave me the extra points himself,” Harry said uncertainly. “Keep your voice down, Ron, do you want anyone to hear us?”

“I’ll be furious when I hear that…” Ron protested, but his voice was noticeably lower. “I’m not going to get locked up for this. Fred and the others will laugh me to death!”

“Me too.” Harry nodded. “Hermione, what are you thinking? You’re not still thinking about going over there, are you?”

He looked panicked.

“No,” Hermione shook her head, “I was just thinking that the professor seemed to be deliberately trying to get rid of us…”

“Then let’s not think about it…” Harry said seriously. “Think about it, he went underground and even caught snakes to catch Lockhart. If we go back, we’ll definitely be discovered.”

-

"The troublemaker is gone... This intimidation should be effective for more than a month."

'He even fooled himself in order to get rid of people…' William shook his head and began testing the Room of Requirement—putting aside the things inside, he was very curious about the room itself.

"Let's start with something absurd."

"Food, something that defies the common sense of magic, can it just appear out of thin air?"

……

After some testing, William was relieved—the hut he had imagined, filled with food, did not appear.

'It's still within the realm of magic, just beyond my knowledge.'

That puts my mind at ease—things outside the realm of magical common sense can't be too outrageous.

'I can't eat anymore, next thing—I need a room to sleep in.'

...

feasible.

"A house full of toilets—"

...

feasible.

Then came all sorts of tests—brooms, books, clothes, chairs, a certain magical book, another certain magical book…

The various experiments took William a long time to complete, but the more experiments he conducted, the happier he became.

This house, which Harry and his friends called the Room of Requirement, wasn't actually able to grant every wish, but it had reached the limit of magic—it could basically fulfill all the random things William asked for.

However, the books only show what William already knew, and never what William did not know.

He didn't conjure the book's contents out of thin air, nor could he record the memories of previous users; he simply displayed what William remembered.

'One Piece and Hunter x Hunter still have no ending... and they don't always grant requests!'

Galon won't work either; Galon is a magical coin that's conjured up—it loses its power when taken out.

But aside from these basics, what about the other functions?

William couldn't believe that so few people had discovered Hogwarts in its thousand-year history.

Has no one tried to hide something here over the years?

Take your time…

"What I need next is—the room where Ginny hides her things!"

Chapter Twenty-Five: Blueprints and the Bets

Nothing appeared...

This result slightly surprised William.

Previous speculation suggested that this place might not appear when someone was using it—but William just tested it, and no one entered the middle.

'Wait!'

'I was just thinking about where Ginny hid things—but Lockhart told me exactly that it was where Hufflepuff's tiara was originally hidden!'

The problem lies with the word "concealment."

'The crown has been discovered, so it's no longer hidden, therefore the room can be found. But where Ginny hides things... that word is too vague. Lockhart may not have taken the only thing; even a single hair falling out could be considered hidden in the room... Items still in a state of being hidden are still protected by the word "hidden"...'

Strange theories began to form in William's mind, and in order to conduct the experiment, he began to try another keyword.

'The place where Hufflepuff's crown was originally hidden...'

...

The door opened this time, but William didn't rush in.

'Interesting. So even the word "concealment" is protected by a magic that grants every wish?'

'We'll continue testing later—there are more areas in this room that need testing than I imagined. Just who could wield such exaggerated, almost miraculous magic?'

With this thought in mind, William pushed open the door Lockhart had mentioned.

Then—he froze.

In a room the size of a cathedral, the beams of light streaming through the high windows made it look like a city with towering walls.

Even the largest room in the castle, the Great Hall, isn't this big, and the library is pitifully small compared to this enormous room—it's practically a community here.

His earlier guess was correct; it wasn't just these few students who had discovered this place. In the nearly one thousand years since Hogwarts was founded, countless students had found this room and stuffed their own things into it.

'Even Azkaban's safe deposit boxes aren't this well-equipped,' William remarked, looking around at the dilapidated state of the surroundings.

There's no way I can help but complain; there are just too many things related to dark magic—a rusty sword and a bloodstained axe, all sorts of random books, broken chairs used as targets for dark magic attacks or for weddings, you name it.

'There might even be junk that the Dark Lord and his men used,' William guessed, then took a small vial of potion from his pocket and placed it on the shelf.

Let's try it again.

He didn't explore further and left the room.

'I need to find the room where Professor William is hiding things…'

I passed by three times—and gained nothing.

Change the password—I want the room where I'm hiding things.

The door reappeared this time; it was the same door that had been opened last time.

'Interesting, really interesting—the house where the things are hidden points to something?'

William neither touched the medicine nor continued his investigation.

“Then, let’s try it again.” He left the room—“This time I need a room that no one but Professor William can enter.”

...

This time, the room that was opened was small and empty.

A new password was discovered.

'That's not enough, we need to test the vulnerabilities!'

William ignored the room and quickly left, intending to find a guinea pig for further experimentation.

-

"Professor, I'm here. Is there anything I can do for you?"

Percy came running up, panting, following the painting, which brought a smile to William's face.

“It’s a personal matter, Percy. I need a trustworthy assistant.” William smiled at Percy. “It’s a bit of a waste of your vacation time. I’ll make up for the extra allowance privately.”

“No need, Professor, really.” Percy had the expression of a New Year’s kid.

“You deserve it,” William said, handing him an envelope containing three Galleons without further ado. “I get paid for teaching, kid. Your work should be respected.”

After paying the money, William felt perfectly at ease—"Alright, Percy, now you've changed your name. You're no longer called Percy Weasley; you're now Professor William."

"professor?"