Hearing the reason for Jin's visit, No. 700672 nodded broadly.

"<>, huh? So, what exactly do you want?"

"Oh, first of all, please take this."

Jin presented ten bottles of recovery medicine he had brought with him to No. 700672.

They are rich in free magical element (ether).

Upon receiving them, the 700672's face broke into a slight smile.

"Oh, this is the same medicine as the one I was given the other day. I'll take it gratefully."

He immediately opened a bottle and drank the contents.

"Well, it works well, after all. I appreciate it."

Seeing her father like this, Neige is smiling happily at the side.

After settling down, Jin begins to talk.

"The other day, Dexiconai used the Aether Stampede.

"What?　I heard a blue-haired automaton say something like that the other day. Can you tell me more about this Aether Stampede?

"Yes, sir."

Jin then explained everything he knew about the "Aether Stampede".

No. 700672 thought for a while, but then seemed to have reached a conclusion and slowly opened his mouth.

"Aether Stampede... ....... That is certainly a threat. I and Neige here will not get away with this.

Neige grabbed the sleeve of the 700672 tightly.

"A weapon created by the Dexiconai. I don't know.

The 700672 closes its eyes and thinks about something. Then he opens his eyes and looks at Jin.

"So, what you want to ask me is how to prevent it?

"Well, that's what I'm trying to ask. To be more specific, I would like to know if you know anything about magic and the technique of converting mana back into free magic element (ether).

"Hmmm... ...... you mean, about the technology to manipulate free magical element (ether)?"

"I guess that's what you mean."

He looked down for a moment and thought about it. Then he looked up, looked at Reiko, and opened his mouth.

"That automata there, from what I can see, is using an ether converter and a mana driver, isn't it?

Just by looking at it, No. 700672 seemed to have an idea about Reiko's power source.

"I can see that it is running with great efficiency. But my masters were using a Magi Reactor."

"<>?　Is it something that converts ...... free magic element (ether) into magic element (mana) and at the same time converts magic element (mana) into energy?"

"Oh, that's right. You're a quick study. It works as both an ether converter and a mana driver in one. Naturally, there is little loss."

Jin understood this logic well, and he had thought about it. However, it was difficult to control and prone to run out of control, so he had stopped. Jin explained it to him.

"I see, you have thought about it. The fact that it is easy to run out of control is inextricably linked to control.

"I understand that."

No. 700672 nodded his head and continued.

"Now, to answer your first question. If you want to have complete control over the free magical element (ether), you need <>. ...... I see, you didn't have it in this world.

"What?"

Jin asked back because he didn't understand. To Jin, No. 700672 nodded with a knowing look on his face.

"<>...... concept doesn't even exist. It was a common substance on my masters' home planet ...... Hale. In ordinary language we would call it ......<>."

"A psychocatalyst ......?"

I try to imagine what it is like in a dim way.

"You seem to have an understanding of the activation of magic, and you also seem to understand that mental waves are a kind of magic waves. Well, you can control the free magical element (ether) more efficiently by using that substance.

But what we don't have, we can't do without. Jin changes his mind.

"Then let me tell you something. It is up to you whether you can understand it or not.

The 700672 looked Jin in the eye and began to speak.

"All magic is caused by magic power.

Jin nodded silently.

"Then, what is the magic power here?　It is an invisible, powerful wave.

This was consistent with the assumption Jin and the others were making. Again Jin nodded.

"Because magic power is a wave, it has a wavelength, a height, and a waveform.

No. 700672 looked at Jin's face to confirm that he understood and continued.

"It is this magic power that gathers free magic element (ether) existing in space, and it is also magic power that changes free magic element (ether) into magic element (mana). And it is also by magic power that the mana is converted into magic."

"Yes."

For the first time, Jin nodded aloud.

"So you're saying that everything is based on magic power, although the roles are different. Then how can magic power do so many things?

No. 700672 looked into Jin's face as if testing him.

"Isn't it due to the differences in wavelength, wave height, and waveform that you were talking about earlier?"

At Jin's answer, No. 700672 nodded in satisfaction.

"That's right. The biggest difference is the wavelength. In other words, it can be said that the frequency ...... is the frequency of vibration. Now, every mage can emit a little magic power on their own. Let's call it a psychic wave.

"Yes."

"Mental waves are the original magical power that a mage can create. Using this, the surrounding free magical elements (ether) are converted into magical elements (mana), and the magical elements (mana) are converted into energy to activate the magic.

Jin senses what 700672 is trying to tell him and concentrates more.

"You seem to know the activation procedure ......, so I'll skip it for now."

Up to this point, Jin had understood and followed the message. Seeing Jin's face, No. 700672 looked a little happy.

"Hmm. You have a good understanding. Then let's go on.

"Yes."

The 700672 chuckles.

What is this energy?　If it's fire magic, it's thermal energy. If it's wind magic, it's kinetic energy. Do you understand ......?"

When he saw Jin's nodding face and knew that it was not a glorification, a pleased look spread across the 700672's face.

"The magic power in the name of mental power is amplified into greater magic power, and it also controls energy. This explains magic from a different angle."

Jin sensed that he was finally getting to the heart of the matter.

"The frequency of the magic power used differs depending on the attribute.

The same thing that Saki and I had discussed the other day at Horaijima was told by the mouth of 700672.

"Now, then, what frequency do the spirit waves have?"

Jin and the others did not know that much either. This is because it is not possible to quantify magic waves.

It was previously mentioned in the Magecraftsmen's Guild of the Kingdom of Egelea that an automata named Donna could read the characteristics of magic, but....

However, this was only a superficial characteristic, not a true analysis of magic.

To use an analogy, we can think of it as the relationship between AM radio waves and voice data.

The radio wave, which is the carrier wave, has a frequency from about 530 kHz to 16 The frequency of the carrier wave, the radio wave, has a frequency of about 530 kHz to 1600 kHz, and its wave height and waveform represent the voice data.

The frequency of audible sound is from about 20Hz to 20 kHz, the carrier wave has a frequency more than 1000 times higher.

I will omit a detailed explanation of the principle of radio, but the sound signal is extracted from the radio broadcast wave through a process called wave detection.

Let me digress.

The magic that can be detected by ordinary people is the part corresponding to this audio signal, and the carrier wave is usually too high in frequency to be detected.

This is exactly what was explained in No. 700672.

"Mental waves have a considerably high frequency among magical powers.

This was new to Jin. His eyes lit up as he listened. Seeing Jin, No. 700672 asked him in a testing manner.

"Your automata, what attribute magi crystals (magi crystals) do you use in your ether converter?

"All attributes."

Hearing this, No. 700672 shook his head.

"Of course. That's an easy mistake to make.

"Why?

Reiko, who had kept quiet until now, seemed to be unable to keep her mouth shut now that Jin had said something that negated her.

Neige, who had been following No. 700672, glared at Reiko with such vigor.

"Reiko, it's okay. ...... understand. You want me to use light or dark magi crystals, right?"

Hearing this statement, No. 700672 nodded her head broadly in satisfaction.

"That's right. Since the frequency is high, it would seem that it would be better to use the dark attribute, but it is known empirically that the light attribute's magical crystals (magi crystals) are the most efficient."

All attributes naturally have the light attribute as well. However, since other attributes exist at the same time, the efficiency of the use of the light attribute has been reduced.

"I am talking only about ether converters. For magic, all attributes are still effective in their own way.

"I suppose so."

So far, this has been a very useful talk for Jin.

"Now, about the power to manipulate free magical element (ether), you have learned a lot so far, haven't you?

"Yes, indeed.

Without a pause, Jin nodded.

"Now, how do we control the magic power? Naturally, the source is mental power. We cannot go beyond the upper limit of its frequency. How about you ......?"

"I don't know. We have no way of knowing the frequency of the magic wave at the moment.

"Well, that's honest. ...... Neige, show him the way.

"Yes, Father."

That was all it took for Neige to understand, and she gave Jin's hand a squeeze and pulled him in front of one of the windows in the wall.

"You may emit your magic power toward that window. The color of the window will give you a general idea."

"I understand."

Jin gathered magic power in his palm and emitted it toward the window.

"Oh!"

700672's voice sounded surprised. But Jin still did not understand what it meant.

"What is this?"

The dark window shone a bright blue.