On the academy playground, Merlin and Alice are building a snowman.

Although it had snowed hard last night that almost froze poor Alice to death, the snow in the school had already been removed by the sanitation staff, and now Merlin and Alice were playing with the snow that Cynthia had just made.

"Is this magic, it's really powerful."

Merlin's eyes lit up as he looked at the transparent cube barrier not far away, and his occult knowledge told him it was the Sky Locking Charm, a sorcery that sealed off space within an area.

Time and space as the two most powerful forces, all the witchcraft involving time and space has no low-level goods, even if the space lock spell is only one of the more basic space witchcraft, but even so, the normal air lock spell requires four high-level wizards to stand in the four corners of the joint spell to be able to successfully cast, and the blockade range is not too large, generally only a space within a radius of about 100 meters.

However, now the entire locked air lock spell in front of him, which will be a thousand meters long and about five hundred meters wide, is just the result of Cynthia's snap of her fingers, this ghost woman didn't even chant the spell or take out the staff, and it was as if she was really just snapping her fingers.

At this time, in the blocked playground space, a tornado-like ice and snow storm was raging, even if the storm seemed so terrifying, and it was close at hand, but if it was usually enough to easily blow the entire school into a blizzard, it could not have the slightest impact on Merlin and the others outside the barrier, and it could not even shake the stupid hair on Alice's head.

After all, even if it looks close at hand, what separates the two is the distance between the worlds.

Just like the funny world globe, the world you are in may just be a transparent glass ball, and on the outside of the ball, a group of unknown creatures may be lying on the ball and peeking at the world inside the ball. The inner space of the Void Lock Spell is the world sphere, and Merlin and the others outside the barrier are the observers outside the ball, unless the inner space is strong enough to tear the space and break the dimensional wall, otherwise the things inside the space will never be able to affect the outside world by themselves.

On the contrary, as the caster of the Void Lock Spell, Cynthia was free to influence everything in the inner space, she just waved her hand, and the ice and snow condensed by the cold storm in the air automatically flew out, and then fell in front of Merlin, becoming the fresh material for his snowman.

Next to the snowdrift was a handful of dust, which was the impurities in the air that had been separated from the interior by the Dust Removal Charm.

"Brother, then just cool down or pressurize the next."

Seeing that the storm was no longer able to condense the ice and snow, and knowing that the moisture in the air in the space had been drained, Cynthia turned back to Merlin to confirm.

"Well, just cool down or pressurize, of course, you can also come together."

Merlin nodded, but then he was a little worried.

"Sister, are you sure you still have enough mana?"

He asked, a little skeptically.

After all, Cynthia had already released a number of spells before, except for the illusion spell used to cover up the movement of the experiment and the dust removal spell used to remove the dust, the other empty lock spells and the ice storm were all high-level spells that required a lot of mana, even if Cynthia was a sage, but the sage also had a blue bar, and he was a little worried about Cynthia's magic reserves.

After all, the next consumption of the cooling spell to be released is not for fun.

This is not to say how advanced the Ice Spell is, in fact, the Ice Spell and the Fire Spell are two introductory spells of the ice and fire types, but these two spells also have their own incredible characteristics, that is, the Ice Spell can be cooled down indefinitely, and the Fire Spell can be heated up indefinitely.

Well, that's right, as long as your magic power is enough, you can directly use these two basic witchcraft to freeze the entire world or incinerate the entire world, which is something that those high-level witchcraft may not be able to do, as far as Merlin knows, even the low temperature created by the ice Age, the most lethal forbidden spell of the ice type, is only about a hundred degrees below zero, and the temperature of the forbidden spell of the fire type Eternal Sun also has a limit.

Although those forbidden spells have high damage, the structure is too cumbersome and complicated, and as we all know, the more sophisticated the instrument, the easier it is to break, but some simple and rough things are exceptionally durable, and the same is true for spells, and the structure of these two basic spells is that extremely simple but extremely stable type.

It's a pity,Unlimited cooling and heating up is only theoretical.,It's basically impossible to achieve in reality.,After all, no one has such a huge mana reserve.,Ice Spell and Fire Spell are basic spells after all.,Stability is stable.,But it's also a fact that it's inefficient.,Although the release consumption of these two spells is almost negligible at the beginning.,But as the temperature gradually decreases or increases,Your mana consumption will gradually double.。

Well, that's right, it's doubled, anyway, if you want to use the Ice Spell to achieve the effect of Ice Age, the magic power you need to consume is enough for you to release dozens of Ice Age, so, as long as such a loss-making transaction is not stupid, no wizard will do it, and if you want to, you can't do it, no one can have such a huge magic reserve, and there are not many people in this world who can release Ice Age once, let alone release it dozens of times in one breath, how can this kind of pervert who uses the forbidden spell as a flat A exist.

However, Merlin, if not mistaken, liquefied the air at a temperature of about minus 200 degrees, which was lower than the temperature of the Ice Age, and Cynthia had to consume mana.......

Hiss..... It's hard to imagine that even Cynthia can't have such exaggerated reserves of magic power.

Of course, Merlin didn't expect Cynthia to really reduce the temperature to minus 200 degrees in one go, he had already referred to the principle of the air liquefier in his previous life when designing the experiment, using the thermodynamic principle of simple compression and heat release, expansion and heat absorption, as long as the air is cooled and compressed first, and then the pressure is released and let it expand, then the heat absorbed by expansion is enough to reduce the temperature to the point where it is enough to liquefy air.

The next step is to compress the air and cool it with the Ice Spell for initial cooling, and finally release the pressure to expand the air and absorb some of the heat for secondary cooling, so that it can probably reach the critical temperature of air liquefaction. (Actually, in reality, it's more complicated, I'm just a weak, pitiful and helpless liberal arts student, don't take it seriously.) ）

At least there is steam in this world, and there are also three states of solid, liquid and gaseous objects, so the thermodynamic common sense of expansion and endothermy and compression and exothermia should also be valid.

"Anyway, as long as it cools down to minus 100, I still have this level of magic."

Regarding Merlin's concern, Cynthia raised her head and replied with a smug face.

Merlin: "......"

What else can he say, he can only say that his sister is awesome, this is not a reserve of magic power that humans can have at all.

emmmm, well, it seems that Cynthia was originally a half-elf, not a human, but other pure-blood elves are not as perverted as you.

"But it's a shame that you can think of using this method to cool down, worthy of my proud brother."

Cynthia snapped her fingers again as she complimented Merlin.

The void film in the Void Lock Spell began to shrink wildly, this is the Compression Charm, a high-lethal sorcery that wizards usually use to compress enemies into a piece of meatloaf, and this is the first time it has been used to compress air like this.

With the compression, Cynthia's ice spell was also ready, in order to absorb the heat generated by the compression, and soon, in the originally transparent air, pieces of white crystals were born.

Seeing the white crystal, Merlin breathed a sigh of relief.

"Dry ice, solid carbon dioxide, that's right, my scientist is not dead."

Cynthia had seen the dry ice before, and her eyes lit up and her hands moved faster and faster.

After throwing the same dry ice out of the Void Lock Spell to Merlin to play, Cynthia soon lifted the compression spell, and the compressed air was released, with a bang, the barrier of the Sky Lock Spell rippled in circles, and everyone looked again, and saw that the bottom layer of the inner space was covered with a layer of light yellow liquid.

"It's finished."

Merlin cheered inwardly.

Cynthia waved her hand, and the massive Void Lock Spell shrank, eventually turning into a small box filled with the unknown liquid, floating in the palm of her hand.

Looking at these unknown liquids, and then at Merlin, Cynthia smiled.

Her brother seems to have made something terrible.