"Cooling first or ......"

Jin was working with the old man on the development of a new weapon. Elsa is assisting him.

"It's a way to take away the heat energy, right?"

"Yes. But, I think we should analyze the ice magic <. I think we can analyze this."

Ice magic is causing phenomena that cannot be explained by thermodynamics alone.

"Elsa, could you try to use snow bullets on the table?"

"Yes, sure."

Jin went outside the laboratory with Erza and started to analyze the magic.

"......<"

Snow is generated from Erza's hand and flies away at a considerable speed. Jin examined it with the magic of tracing.

"Hmmm, I guess the basic idea is cooling.

Engineering magic <<. It is a magic to cool overheated materials.

"Let's figure out the principle of this, modify the activation method, and see how far we can lower the temperature.

With the help of Reiko, Jin and Erza analyze <>.

"......As I thought, there is no convection, conduction, or radiation, but heat is being lost. ......"

The instantaneous cooling of a highly heated object is truly magical.

"I can only think that heat energy is being transferred to some other space or dimension. ......"

Jin made such a hypothesis and modified the cooling system based on it.

"Brother Jin, is there such a method?"

Erza, who was watching from the side, looked up at him.

"Yes. Perhaps the key is the Magi Formula here. You can't modify magic if you're stuck in the conventional wisdom.

"I can see that. Brother Jin is that kind of person.

After much trial and error, Jin managed to perfect . He named it Absolute Zero.

Perhaps, it is a magic that transfers the heat energy of an object to another dimension instantly.

By adjusting the intensity, it is possible to cool the object from a very low temperature close to absolute zero to a temperature below freezing. However, the consumption of magic power is quite high.

Erza can use it only once, and it may be almost empty of magic power. It is likely to be used by making a magic tool.

* * * *

Laojun has been making a plasma sword using the mobile terminal.

The biggest problem is strength and durability.

The hastily made plasma sword based on <<> that Jin had modified was 500 times more powerful than the original one.

Since the plasma is a billion degrees Celsius, even if it is confined in a very powerful ward, the effect of the heat on the main body is not insignificant.

If you hold it for a long time, it will be so hot that you will not be able to stand it.

This will allow us to release the excess heat.

The remaining problem is the extremely high consumption of magic power, but we can deal with it by using high quality magic crystals and installing a highly efficient magic element converter (ether converter).

However, the consumption of magical power is far from Reiko's 100 percent (about 40 percent).

For Titan, it was relatively easy to simply increase the size of the sword.

The old man was already working on mass production.

* * * * * * * * * * * * * *

"I'm going to make a boundary bomb.

Jin, who had finished the development of the "Absolute Zero", said.

"A boundary bomb?"

Reiko asks. Elsa was silently listening.

"Yeah. What we want to do is simple. We put a barrier around the object and make it shrink."

"...... could it be crushed?"

Erza asked, this time with a frown on her face.

"Maybe.

In the Magi Crystal, we write the Magi Formula to create a barrier and the Magi Formula to make it shrink. Finally, set the formula to be activated by a specific magic power, and you are done.

The prototype itself was completed in 10 minutes.

"Okay, let's try it out."

Jin went out in front of the laboratory, had the shell of a small gigantopod prepared, and threw the prototype warding bomb at it.

"<>"

The key word created a barrier. It enveloped the shell and part of the ground. It shrank as it went on.

There is a cracking sound, and the shell can be seen to be crumbling.

The spherical barrier, which was initially about 5 meters in diameter, is now less than 1 meter in diameter.

When the spherical barrier was about 30 centimeters in diameter, the tremendous pressure generated inside the barrier bomb destroyed the barrier itself, and as a result, the barrier disappeared.

What remained was the rounded, hardened shell of a gigantopod. It seems to be quite heavy, judging from the fact that the shell is sinking into the ground under its own weight. Or rather, if the original weight has not changed, the density must have increased more than 50 times.

"Reiko, try to see if you can cut it with Momoka."

"Yes, Father."

Reiko brought her special weapon, the Peach Blossom, from the laboratory.

"Here I go."

She raised it and slashed at him.

A rather muddy metallic sound echoed, but the blade never dug in, not even a millimeter.

"Okay, let's try again with the super high-speed vibrating sword mode.

"Yes."

Same thing this time. No, Momoka's blade is chipped!

"Stop!　...... wow ...... did you make a material stronger than Magi adamantite?"

The test of the boundary bomb was successful, and an unexpected new material was created.

"<>...... I knew it."

"Brother Jin, what did you find out?"

"...... molecular structure is compressed."

"What?"

It is usually unthinkable, but the shell of the gigantopod, which is a material with magic power, did not collapse when compressed, but remained stable in that state.

"Is it the function of free magic element (ether)?　If it is ......, it could be applied to Magi Adamantite."

Jin, who has made another, even more powerful boundary bomb, has the Magi Adamantite, which is about one cubic meter in size, prepared. It weighs 19.3 tons. Only Daidara or Reiko could carry it.

Jin threw a boundary bomb at it and activated it.

This time, a spherical barrier of about 2 meters in diameter was generated, and it contracted. When the spherical barrier was about 60 centimeters in diameter, it collapsed and the spherical barrier disappeared, just as before.

What remained was magi-adamantite compressed to nearly 60 cm in diameter.

It is a sphere about the size of a small hand. But an extraordinary material weighing nearly 20 tons was produced. Specific gravity is about 200.

"This is amazing ......"

Not only the weight, but also the hardness seems to be extraordinary.

"I call it hyper adamantite!　Let's repair Momoka with this!"

Jin was as excited as a child when he saw the new material. Erza looked at him with curiosity.

Since the sword would be too heavy if the entire blade was converted to hyper adamantite, the new material would be used for the blade and sandwiched between the original magi adamantite, just like a Japanese sword, in order to keep the weight increase to a minimum.

Of course, the "Vibration Sword" mode, a super high-speed vibrating sword, is still included. Since the base is Magi Adamantite, it can be further strengthened by applying magical power.

"All right, Reiko, use this to cut the remaining hyper adamantite."

"Yes, Father."

Momoka, which has tripled in weight. Reiko swung it lightly and slashed at the hyperadamantite ingot as it was reinforced through magic power.

With a clear, high-pitched metallic sound, the ingot was cut in half. The sword is not in Vibration Sword mode, but is at the magic-enhanced level, and has such a sharpness.

"Amazing ......, you have become the most powerful sword!"

"Thank you, father."

Reiko, who had been depressed when she chipped Momoka's blade earlier, now had a happy smile on her face.

* * * * * *

<

The old man was curious about the mysterious magic device that was found in the underground of the mine.

It would be a few days before he would develop a boring machine for underground exploration.

Thus, new weapons and new materials were developed, and the forces of Horai Island were further strengthened.