In the magical world, there are usually three ways to hide something.

The most common is naturally using the Muggle-Repelling Charm, creating a restricted area in the subjective consciousness.

Most wizarding residences, event venues, or other wizard gathering places often employ this magic.

However, this merely imposes a psychological suggestion.

In effect, it mainly causes Muggles who accidentally approach the area to suddenly remember some urgent matter and hastily leave, without hiding the objective existence of the area in any visual or conceptual way.

A slightly more advanced method involves spatial magic to fold and misalign the real scene with reality.

For example, St. Mungo's Hospital for Magical Maladies and Injuries, the British Ministry of Magic, and Diagon Alley are connected through special entrances, hidden like mirrors on the back side of the non-magical world. Strictly speaking, Newt's suitcase and Aileen's Human Heart Wallet are based on similar principles.

As for the more profound techniques, they often involve modifying concepts and cognition, which is beyond the capabilities of ordinary wizards.

In today's magical world, the two most well-known types of concealment magic are the Unplottable Charm and the Fidelius Charm.

The former makes an area conceptually impossible to appear, just like the land belonging to Hogwarts Castle is simply absent from maps of the Scottish Highlands in the non-magical world. It vanishes from people's world like a drop of water. The Fidelius Charm takes it a step further, abstracting a place into an encrypted file, hidden within someone's soul, disappearing directly from people's awareness.

In terms of effectiveness, the Fidelius Charm is obviously the best, but most people have limited soul capacity.

Perhaps top wizards like Dumbledore can hide a castle in their hearts, such as Nurmengard Castle.

But for ordinary wizards, being able to hide a three-story cottage is already quite remarkable.

Therefore, after careful deliberation, Aileen and her friends adopted another form of composite encryption.

…

"This feeling is... amber?"

Hermione slowly opened her eyes, looking around with an unnatural expression.

Behind her, the swirling black nebula was gradually shrinking and closing.

Unlike the hall scene she had imagined, they were now in the center of a vast wilderness.

Most importantly, just now, that somewhat unpleasant, permeating sensation had once again left its mark on her body.

"Huh? Since when did your intuition become stronger than Luna's?"

Aileen looked at Hermione with considerable surprise.

She found that Hermione seemed to have a special talent for spatial perception.

It should be known that most people find it difficult to tell whether they are staying in the main space or have entered a sub-space.

"Yes, that's right. In principle, this is a giant amber."

Aileen nodded, raised her head to look at the sky, and continued to explain triumphantly.

"However, we are more accustomed to calling this place 'Outland' or 'the Reverse Side,' because, unlike the small amber on the Hyperion, the spatial barriers here are permanent. It is a world bubble completely isolated from the main world, which can be regarded as another world."

"So, that door just now... is actually an entrance similar to the wall of Diagon Alley?"

Hannah asked, half-understanding, turning her head to look at the stargate that had long since disappeared.

"Yes, and no."

Aileen raised a finger and said with a smug look.

"Without 'sharing' from me, behind the door would only be Gringotts and Destiny Group's headquarters in the 'City of Succubi'. The real coordinates of that dark stargate are hidden deep in my soul. However, if you know this information, you can enter and exit normally afterward—of course, you can also choose not to open the black gate and walk straight in from the door to visit the work area..."

"Are there many things related to 'adult games' in the work area?"

Hannah asked quickly, her little face flushed, not knowing whether from shyness or excitement.

"... I'm not introducing the 'City of Succubi' work area right now, I'm introducing the mystery of the Reverse Side."

Aileen said with a helpless expression. Fortunately, Hannah would not be going home this Christmas, otherwise who knew what she would ask in the tavern.

Although she was not worried about a Howler from the Abbott family, it would undoubtedly be best if she could get through this "novelty period" smoothly.

"But, this is a wilderness."

Just then, Luna raised her head and looked at the sky, saying somewhat uneasily.

"Aileen, do you know which direction we should go? There are no road signs around..."

"Oh, I know our destination—"

Aileen raised her finger triumphantly, looked around at the empty, desolate environment, and said softly.

"In the Amber World, I only need to know the destination, and that's enough—do you remember what I said before? The amber unfolds with someone as the origin, and as the anchor point of this world, I have the origin authority in the Amber World."

"Origin authority? What does that mean?"

Hermione frowned, looking at Aileen in confusion.

"It's very simple, come on, grab my hand—"

Aileen shrugged and extended her left hand to Hermione, Luna, and Hannah.

"Um, and then what?"

The three of Hermione reached out their hands, confused and asked.

"Oh, and then—"

Aileen blinked her eyes and took a step forward with incomparable ease.

The surrounding world instantly blurred, as if the earth had begun to rotate and move on its own.

They clearly hadn't moved a step, but the surrounding environment instantly changed from a desolate wilderness to the top of a metal building full of futuristic sci-fi atmosphere. Before their eyes was a giant office that looked like the bridge of the Hyperion.

Aileen lightly released their hands, turned around, spread her arms, and said with incomparable pride and a smile.

"Welcome to, Valkyria Research Base—this is the Valkyrie's lounge."

As the starting point for the unfolding of this Amber World, Aileen would never get lost in the Amber World.

No matter where she wanted to go, the world would automatically arrive at her feet.

"So, we can start learning to pilot... Valkyria?"

Hannah looked curiously at the floor-to-ceiling windows, looking around at the luxurious office.

On the wall opposite the floor-to-ceiling windows, hundreds of design drawings covered the wall.

Fighters, flying broomsticks... and various kinds of armor and aircraft, design drawings outlined with lines and numbers exuded a delicate beauty that these little witches had never seen before. Hannah even excitedly began circling around Aileen, wanting to set off quickly.

The freedom to fly, that was one of humanity's dreams since ancient times.

Compared to flying on a broomstick, the "Valkyrie" armor that Aileen showed off surpassed it by more than just one era in terms of appearance and effect.

"Yes, that's right, we can start later—"

Aileen squinted her eyes, folded her arms, looked at the excited little wings, and said with a smile.

"You will be involved in the training program and aircraft development as the second batch of Valkyrie pilots... However, one thing to point out in advance is that the operation of the 'Valkyrie' armor is slightly different from traditional flying broomsticks and wands—"

…

The Valkyria pilot training program soon became a love-hate aspect for the three little wings.

This is not difficult to understand, after all, strictly speaking, the core drive of the "Valkyrie" armor lies in the dual action of algorithms and magic.

When the scattered armor pieces controlled by Hermione could play sheet music on the piano, Hannah was still struggling with how to prevent the abdominal armor from pressing backward along with the chest armor during deceleration, while Luna was between the two, and she could barely manage to keep the armor pieces in a human shape.

However, no matter how the three little ones coerced and tempted, Aileen never allowed them to connect directly.

"Not yet, you haven't reached the minimum passing mark."

Aileen put down the three people's training scores and said with extreme seriousness, with no room for turning back in her tone.

"Hermione, you have qualified in algorithms and flight modeling, but your resonance with the 'mecha' is not enough—concentrated flight is too dangerous for you, you must make the concept of 'levitation' become an instinctual command state. As for Hannah and Luna, for the two of you, this is not as simple as a flying broomstick. If the 'Valkyrie' armor disintegrates in the air, you know what the consequences will be."

For a long time, Hermione, Hannah, Luna, and even most little wizards did not understand how high Aileen's flying talent was.

In fact, just like a perfect exam paper, it is difficult to judge the talent of Aileen, Charlie, Harry, Cedric... those wizards who are almost born to be good at Quidditch based on their flying performance on the Quidditch field, because the upper limit is there.

However, with this weekend's training, the three little ones clearly realized for the first time what it means to be the queen of the sky.

Unlike their clumsiness when operating Valkyria, Aileen could very easily command that set of training armor to fly in the air, whether in armored or unarmored state, as if she was not relying on Valkyria to fly, but she was endowing the "Valkyrie" with the magic of flying.

There is actually nothing wrong with saying that, after all, wizards are essentially the power source of the "Valkyrie" armor.

In the eyes of Luna, Hermione, and Hannah, Aileen's flying was as natural as running and breathing.

Aileen had also explained her conjecture about this.

After all, Veela are magical creatures that can fly, and as their bloodline purifies, her talent in the field of flying will obviously gradually strengthen.

Of course, this flying "feeling" is not something that cannot be cultivated—in fact, if this problem cannot be solved, then the practical value of Valkyria will be greatly reduced, and they must find a more generalized promotion model.

After several discussions, the Valkyria Research Institute developed some interesting training props for the three little ones.

"Hermione, your little beaver is lying down again..."

Before Hermione could refute, Aileen glanced at Hermione's wrist and reminded her with a smile.

On Hermione's slender and white right wrist, there was now a delicate silver bracelet, with a crystal bead about two centimeters in diameter strung on it.

And inside that crystal bead, there was a cute miniature metal beaver toy. Under Aileen's reminder, the metal beaver, which was originally lying on the bottom of the bead, seemed to be frightened and swayed, re-suspending and floating in the center of the bead.

"I only relaxed for a little while just now," Hermione defended in a low voice, somewhat unconvinced.

"Unconscious levitation, this is the most basic."

Aileen said impartially, "It's too dangerous to rely solely on the conscious mind."

As she spoke, her gaze swept over Luna and Hannah, who also had similar small accessories on their bodies.

However, what was slightly different was that Hannah's was a silver necklace with a "little Shiba Inu" crystal ball hanging on her chest.

And Luna's was exactly the same silver bracelet as Hermione's, except that hers was worn on her left wrist, and what was floating inside was not a little beaver, but a "little chubby chicken."

"Look, Aileen," Hannah puffed out her chest and said with a proud face, "I've been floating all the time."

"Yes, my little owl is too. From this morning until now, it has definitely not touched the edge of the crystal ball."

Luna raised her wrist in imitation and tried to show off her training results from this period of time.

Hermione was obviously a little unhappy.

However, her mood instantly improved in the next moment.

"That's very good, but..."

Aileen picked up two test papers from the desk and placed them in front of Luna and Hannah.

"The full score for the flight theory test is 120 points, but you didn't even get 60 points—in other words, you still mainly rely on vision to identify the direction when flying. When the speed reaches a certain level, you can't even do the most basic coordinated dodge."

"More importantly—"

Aileen pointed to the two piles of messy things stacked in the corner of the office.

"You two, can't keep the 'Valkyrie' armor in a fixed flying form yet, right?"

"It won't be too long, I'm close to finding the trick."

Hannah muttered in a low voice, somewhat unconvinced, her eyes dodging a little.

"If I can try a few more times, I can definitely make it fly, without it falling apart."

"Unfortunately, the holiday is over—we have to go back to school."

Aileen shrugged and said unmoved.

In fact, although none of these three little wings met the passing standard.

However, the speed of progress they showed in the trial run still shocked all the researchers.

In less than two days, they were able to resonate Valkyria to the initial unfolding, which alone was enough to prove their talent.

Of course, part of the reason may also be that their "keys" have a high degree of obedience when activated... Aileen glanced expressionlessly at the "traitor" wands in the hands of the three little ones, wishing she could pull out the lecherous wand cores inside and beat them one by one.

When these things were in her hands, they were not as active and serious as they are now.

"However..."

Aileen looked at the somewhat disappointed three little ones and clapped her hands lightly.

In the next moment, three silver flying broomsticks appeared in the spacious lounge.

"These are the Valkyria's broomstick prototypes—su-17 flying broomsticks. Each broomstick weighs 1.5 tons net and can be unfolded. If you can take them away from here, then you can also take them back to Hogwarts as your secret training broomsticks..."

"Yay!"

"Of course, those homework assignments must also be continued..."

"No yay—"

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Yay!