Hogwarts: The Cat Wizard of the Moving Castle.

"Uh, I don't know."

To be precise, Harry didn't know how the basement was constructed.

Mu En did not make things difficult for him, but explained: "The basement of Moonlight Castle is a small world built completely out of the void. It is like the moon, meshed outside the castle, and the two are closely connected.

In fact, if someone can break through the wall of the basement, they will find that the outside is what I call the void space, which is where I used the [portal] to exile those Death Eaters. "

Harry clapped his hands and immediately understood the key issue.

"I understand!"

Then, Mu En's gaze fell on him.

"According to Miranda Goshawk's book "Analysis and Origin of Advanced Spells", the vast majority of space spells in the current world are explained in detail. The vast majority of space spells in the current world are based on the "Traceless Extension Spell".

As the name suggests, the Traceless Extension Spell is to stretch and enlarge a section of space."

Miranda Goshawk is undoubtedly a top master of spells, and his series of books "The Standard Book of Spells" has always been Professor Flitwick's standard teaching book on spells.

The book that Harry mentioned was written specifically for a small number of spell researchers. Its content was obscure and difficult to understand. Even now, it was like chewing a hard bone for him to read.

But there are some gains.

As for the Tractatus Charm, it could be said that it was the first advanced spell that Harry came into contact with when he came into contact with the wizarding world, which was also the small bag that Gringotts gave them to hold Galleons.

The ability of the Knight Public Train to pass through the cracks in London is essentially a variation of the Traceless Extension Charm, which stretches the space in the cracks infinitely to allow the huge public train to pass through.

“This world.”

Moon simply listened to Harry's story, his thoughts lingering on the word he uttered for a moment.

Then he nodded: "Yes, this is the most essential difference between the two."

"The array you are using now has two layers, namely [Support] and [Stabilization].

That is to stabilize an unstable space.

This is completely unnecessary for this box created by the Traceless Retraction Charm. This is like a tent, it just needs to be propped up, there is no need for an extra layer of walls, which would make the entire space closed off.”

"I see." Harry nodded quickly.

"But this operation is worthy of recognition." Mu En nodded. In addition to the magic array on the wall, there was also a new auxiliary array. Obviously, when making a bold attempt, this kid did not forget the safety issue.

"I have already optimized it. You can study it yourself when you have time." Mu En nodded: "Now I am actually very curious about where you found so many items."

Mu En even saw a golden knife, which was not as useful as silver in mysticism, but

You are quite rich, boy.

"They were all found here." Harry picked up the golden knife. There were also many crucibles of different sizes and shapes around it.

"There is a huge room here, the kind that you can't see the end of at a glance. There are all kinds of things piled up like mountains in it. I think it is the accumulation of various miscellaneous items from Hogwarts over the past thousand years.

There are a lot of things in there. Usually if I'm missing something, I'll go there first and use the Flying Spell to look for it."

"I can't see the end at a glance." Mu En was a little surprised: "It seems that the structure of this house is better than I imagined."

"I'm also surprised. At first I thought the Room of Requirement connected various hidden rooms in Hogwarts with this place, but later I found out that it wasn't the case, or maybe it was composed of a deeper structure." Harry talked about some of his discoveries.

"Let's take a look." Mu En nodded.

"it is good."

In just a moment, the two of them arrived outside the eighth floor.

"Uncle Mu En, what do you want to study?"

"I'm just curious about his methods." Mu En explained casually.

As the two were talking, the door handle of the Room of Requirement began to gradually disappear, and in the blink of an eye, it was gone.

"I want."

He thought for a moment and decided to try the Room of Requirement's ability to judge and recognize needs first.

"I need a house that can handle the full force of my power."

After doing this three times, a familiar round handle appeared in front of Harry's eyes.

"Is it really true?" Mu En raised his eyebrows and opened the door.

What comes into view is a room used for dueling or practicing spells.

Dummies, long tables, and an extremely empty midfield space.

call out--

A sharp green arrow shot out from his fingertips, and the next moment, the opposite wall exploded with a loud bang.

It seems not possible.

He shook his head and closed the door.

Obviously, he only detected the "combat needs" that Mu En had in mind, but was unable to identify the needs in detail.

"I need a unit that can carry a resting membrane index of 1/100, but that's meaningless." This idea of ​​a clear unit is unlikely to be recognized.

Although I have a specific concept of the unit in my mind, it is unlikely that I can actually put it into practice.

“I need a spacious space.”

This happened three times in a row, and two door handles that Harry was very familiar with appeared on the wall.

Taking two more steps back, you can see two huge wooden doors about three or four meters high.

Pushing open the door, an endless huge room appeared before my eyes, with an old sofa, a slowly rotating celestial globe, and dried-up potion material storage tanks overflowing with foul-smelling black mud.

The vixen was flying high in the sky, and the ceiling was about twenty feet away.

It is taller than the auditorium and much wider than the auditorium.

Mu En even saw the little toys he had made in the basement before.

"It looks like all of Hogwarts has dumped its junk here," Moon said.

"Yes." Harry nodded. Every time he saw those things that had once caused him a lot of trouble, he felt an inexplicable sense of familiarity.

"Strange." Mu En recalled the feedback in his mind just now.

Such a huge space suddenly appeared behind the wall, and the sound it caused was extremely small.

If he hadn't used the resonance of the alchemical runes he had engraved on his skull to increase the activity of his brain, he might not have been able to detect the appearance of this room at all.

The entire Room of Requirement was exactly the same as the one he had in his basement.

The Room of Requirement is the satellite of Hogwarts.

And there's more than one.

There are countless satellites, and when the need is felt, this gate will become a connection point, connecting the castle with the required room.

Is this the Chamber of Secrets left behind by Ravenclaw?

Exiting the room, he uttered his final request directly in his mind.

"I need to go backstage in the Room of Requirement."

"I need to go backstage in the Room of Requirement."

"I need to go backstage in the Room of Requirement."

This happened three times, and suddenly, the entire wall began to flow, as if a stone was thrown into a calm lake.

"This is?!"

Harry looked at the wall in surprise. The next moment, a strong wind came from the wall, as if he was facing the roar of a fire dragon.

"Silence!" Mu En pointed his finger, and the violent whistling sound of the wind suddenly disappeared.

Such a loud noise in the middle of the night is very irritating to the ears.

"Uncle Moon, what did you ask for?!" Harry looked at Moon in surprise.

"Just some simple needs." Mu En said.

Then he looked at the wall.

Nothing.

Do you understand my needs but cannot implement them for me?

Or maybe I don't have enough permissions?

"I need access to Rowena Ravenclaw's private study."

This happened three times, and under Harry's nervous gaze, an eagle head statue gradually took shape on the wall.

"This is. Ravenclaw?!"

Harry had heard that there was a talking eagle-head door knocker at the entrance to the Ravenclaw common room. No matter which college a person was from, as long as they could answer its questions, they could enter the common room.

"Password!"

The eagle's head has a dark, reflective metallic color, and every feather is clearly visible, appearing lifelike.

The voice was a light female voice, and seemed more like that of a child.

Mu En inexplicably felt that this was the voice of the Ravenclaw daughter.

Hmm. An inexplicable intuition.

As for this so-called password.

“Extraordinary intelligence and talent are mankind’s greatest wealth.”

"Wrong password!"

Without further words or second chances, the eagle head disappeared into the wall.

"Isn't it this?!" Harry was also surprised. You know, this is the most famous saying of Ravenclaw, and it also runs through the person himself.

"After thousands of years, the Ravenclaw we see now may have deviated from the real Ravenclaw." Mu En shook his head, not too concerned.

"But we may have other ways. Logically speaking, programs that operate with this kind of logic will have corresponding loopholes." Mu En said with a smile.

Then, he began to choose words in his mind.

After a moment, he made a decision.

"I need a room that has a strong Ravenclaw connection."

After a moment, a familiar door opened again.

"Sure enough, the Room of Requirement 'remembers' the aura of Ravenclaw!" Moon explained.

but

They had just seen the gate in front of them.

When I opened the door, I still saw the familiar messy objects, mountains of garbage and chattering vixens.

"Does this have anything to do with Ravenclaw?!" Harry was very surprised.

"I don't know either." Moon En thought. The Room of Requirement remembered the scent of Ravenclaw, but he couldn't remember it, so he couldn't track it by smell.

"Will there be anything Ravenclaw here?" Harry fiddled with a shabby sofa in disbelief.

"The sofa that Ravenclaw sat on? The pen she used?" he muttered.

Mu En raised the corner of his mouth and looked at him helplessly.

"If the mountains of garbage really did start piling up when the school was first established, then that's a real possibility."

As he spoke, his body gradually floated up and hung high in the air.

Looking around, Mu En immediately found the boundary of the room.

It’s estimated to be as big as several football fields.

This is actually a very exaggerated data. If it is larger, it can even form a small ecosystem with its own logic, forming a so-called small world.

"Then let me see why this room is strongly associated with Ravenclaw."