Eren flew down from the sky, and the black smoke all over his body dissipated, but under the shock of seeing Eren move the mountain peak just now, the surrounding wizards all bowed respectfully to get out of the way.

The tall and thin Karkaroff couldn't contain the panic in his heart, and such a huge city floated in the air, realizing that Eren might be relying on a spell... In case you fall... He asked himself about his close relationship with Allen, and he asked in a low voice with a sneer, "Principal Harris, I beg your presumptuousness, I just saw your feat, this power is shocking... What I want to know is... Is the Hogwarts Floating City beneath our feet also held up by personal magic?"

"It's a subtle gravity reversal spell that uses the forces of nature to float by changing the direction of gravity, otherwise the use of magic to cancel it out is something I don't think anyone else in the world can do this, it's called Plocktiv's Peak Movement, which allows you to cut off the top of the mountain, make it float in the air and invert into a floating clod, its section is a smooth surface suitable for construction... Of course, its difficulty will increase with the range of your spell and the hardness of the receptor..."Alan said as he noticed that Karkaroff's goat's curly beard trembled, and the low cry of his usually mellow voice became a little harsh due to excessive panic, so he couldn't help but smile and add, " Although the city and the mountain need to be supported by the spell cast by the wizard, the subsequent mana is provided by a magical creation called the Mithic core, don't worry, my mother has put a lot of thought into the decoration of the new home, I don't dare break it..."

Hearing the exclamations and discussions from the audience, Allen's dementorship received many paranoic thoughts like Karkaroff's murder, and more shocked that he really admitted the fact that he had turned a city into the sky by his personal magic, and he laughed in his heart— Under normal circumstances, the area of the regular floating city is not large, but it is the size of a mountain that has just been cut upside down, and the Grand Arcanist usually expands it later according to the development and population situation, but it is more convenient for modern wizarding society to build buildings, and in order to have a more shocking effect, he chose to use the multiple shadows and let Luna take the handle to expand it first and make it to the sky at one time.

"Magical items like broomsticks, motorcycles, and flying carpets are relatively small, and they don't require much magic support, but now we're talking about a school city, whether or not it's the invention of special spells to reduce the difficulty... Principal Harris has this kind of power, really..."Madame Maxim couldn't hold back the excitement in her heart after witnessing the magic miracle, and began to wonder, "Miser can actually provide magic to ensure that it doesn't fall... This is something beyond my imagination and cognition. ”

"Madame Maxime, I know something, and I'm singing against it... Belch. Transfiguration Today's Driver said, realizing that he shouldn't have denigrated another magazine to his face, "I mean, in some non-academic magazines, I remember having stories about the ancient Magic Empire... There seems to be a description of the floating city and this artifact... Most of them didn't know it, and I didn't believe it before, including myself... Think of them as jokes or Muggle legends... But today, it all seems to be true..."

"Amazing memory, Lord Driver... This magical device can communicate with primitive, pure magical power. It transmits such magic directly... The enduring magical power it generates causes entire mountains to float in the air. Alan said and deliberately looked at the wizarding merchants, "It transmits this kind of magic power directly to the entire territory of the Floating City, and wizards will be able to easily cast magical constancy type spells and create magical items without much effort, and if it makes magical artifacts that are only used within the Hogwarts range, it can even make such quasi-magical items more easily without having to find high-quality alchemy materials and without consuming much of its own magic power..."

The merchants in the stands smelled the opportunity, and the urbanization and levitation would have brought them more benefits, but now their expressions had become a little fanatical after hearing this, even the foreigners who didn't actually have a store at Hogwarts now.

Alan turned his staff upside down and the crystal ball underneath it was facing upwards, and instead of using the hookah this time, he directly projected an illusion - a perfect spherical magic device held in place by an ornate pedestal, which looked a lot like the crystal ball on Alan's staff, but it was one hundred and fifty feet in diameter compared to the surrounding counterparts. The sphere was emitting a very bright glow with a hint of blue light at the edges, as dazzling as if it were looking directly at the sun, with some faint shadows wandering on the surface.

"This is the Mithic Core, which is currently being placed at the top of the Ravenclaw Temple... It's open to everyone, and you can visit as many times as you like. Alan pointed to the general direction of the temple south of the Black Lake, he didn't explain the fact that the area of influence of this one was only one mile, in fact, this one was placed on the Ravenclaw temple to attract the attention of these people on the surface, and by the way, to increase some of the temple's influence on the wizarding faith.

"Principal Harris, you mean to say this energy... As long as you stay in Floating City, will everyone have permission to use it?, and he won't have a power cap problem?" Gusderian Tutley asked a little unwillingly, his eyes full of jealousy as he looked at the power core, and his heart became even more jealous of Hogwarts.

"Don't worry about power, this core isn't generating energy, it's just a porter of magical energy... These little things are not a consumption at all..."Alan said proudly with his hand on his back and without a staff, "In the future, we Hogwarts people, in addition to being able to make traditional magic items more freely, can also use some materials that do not have good metal refining properties to make items with permanent magical effects, as long as these items stay within the influence of Hogwarts... Within our school city, we don't need to spend a lot of money to build any magic greenhouses, we can easily change the climate of a constant area to the climate that is suitable for the magic plants we want to cultivate..."

And the merchants with manufacturing workshops in the audience no longer paid attention to the words introduced by Allen later, and they estimated in their hearts that as soon as these magical items and quasi-magical items appeared, they would sell well, and even Hogwarts would soon face the problem of surplus goods. If they were so easy to craft, the price of magical items would plummet, and the cost of traditional magical products, i.e., the use of more expensive materials and the ability to cast more complex magical constants, should also fall, as it would at least help save a lot of manual effort... And only those who are out of the sphere of influence of the core of Mithera need this traditional item.

"Headmaster Harris, this Mithic Nuclear is so powerful, is it easy to make?Will you announce the function and production method of this Mithic Nucleus and popularize it to all wizards?" Driver's old voice was full of excitement, although more often than not, he was just like an old pedant, but as an academic wizard, he fully understood the meaning behind this nucleus, so his hand holding the parchment was still trembling.

"I'm sorry, Mr. Driver, I think everyone can understand the meaning behind this, it's a Harris family's trade secret and important to Hogwarts...", Alan smiled and confessed that he was thinking about his own self-interest.

Driver nodded regretfully and understandingly, he didn't try to persuade the other party to disclose this knowledge as he had tried to persuade the other party to disclose the magic Animagus before, he knew that the meaning of this strange thing was not the same as the impact of transforming into an animal.

"But I am also a Ravenclaw, so out of respect for Lady Ravenclaw's quest for knowledge, I have placed it in the temple of the Lord of Knowledge, leaving this avenue for self-study for all who wish to study it... However, I have to warn you that although the Mithic core is not effective, it is very expensive in its own right... But if anyone comes into close proximity to it, it's a very dangerous behavior. Alan deliberately made his tone more reverent, he looked at the greedy and jealous expressions of the wizards, resisted the urge to laugh, and solemnly admonished, "Actually, if you are not careful or for some other purpose... If a living creature touches this core, it will be killed instantly... Any item, even if it is a magical creation, will be dissociated immediately if it comes into contact with it, and the necromantic knights or other undead creatures I have arranged to guard it around it will be destroyed instantly....even if its creator is me, I will not be able to move its position once it is activated..."The Headmaster of Hogwarts shrugged again, "So as long as you make sure to... Afterwards, if your loved ones don't ask Hogwarts for compensation, any wizard is welcome to visit... However, judging by my personal experience, I guess that only the silent people in the Department of Mysteries who have been studying witchcraft for a long time can learn something from it. ”