The next day. The in Horai Island were all working together to examine the materials in the <>.

Incidentally, since the contents are documents, it was decided to use > rather than >.

"Well, ...... this one was about elementary water magic."

"This one was on letters, vocabulary and basic grammar.

"This one was also on elementary math."

And so on.

Still, on rare occasions, something unexpected is found.

"Jin, that was a document on earth magic, but this could be useful!

That is the material that Reinhardt found.

Since it has been about two hours since the start of the investigation, we all decide to take a break and listen to the explanation.

< and had a cup of tea.

"Well, I was looking at the material that corresponds to an introduction to earth magic, and in it there was a subtitle <>.

"That doesn't sound like much of a subtitle."

"I agree, but I guess that's irrelevant at this point. I don't know what sense ......<> has."

"Well, I don't know. It's a bunch of individualists, so it's different for everyone. ......"

Goose echoed Reinhardt's sentiments.

"So, the example you mentioned is <, but I heard that stones with a high free-magic element (ether) content and those with a low content consume different amounts of magic."

"Heh ......"

It seems to be true.

Magic works on free magic element (ether). If so, the more free magic element (ether), the greater the effect it can exert.

"I haven't tried it before, but I wonder if the effect of <> is more effective with magic stones or magic crystals than with stones found in those places."

"That would be the case."

"Let's give it a try!"

"That would be interesting."

So, after finishing our tea, we all went outside the institute.

Then, we prepared three kinds of stones of about the same size, <> (granite), <>, and <>.

I'm going to ask Reiko to fire them with a stone barrette and report back to me the magic power consumed.

"Well then, Reiko, please do this for me."

"Yes, Father."

Reiko understood the purpose of the experiment, so Jin could leave it to her with peace of mind.

"Okay, here we go. ......<<><><><>"

"Oh."

"......, you flew."

I think it flew all the way to the ocean.

"Yes. I didn't want it to fall on Horai Island and hit something, so I targeted the center of Tatsumi Bay.

"That's great. ......"

"That's what I'm talking about, Reiko."

"...... and the result?"

"Yes, father. As expected, the ordinary stone consumed the most magic power, followed by the earth-attribute magic stone and the earth-attribute magic crystal.

"I knew it."

"Yes. The difference is not so much ...... as a ratio of 10 to 3 to 1."

"I see, the difference between <> and <> is about 10 times greater.

This was a new discovery.

It was an effect that no one in the <> had noticed before, and could be called a blind spot.

Returning to the cafeteria, Jin and his colleagues exchanged opinions, almost chatting with each other.

"That was a blind spot. ......"

"Everyone has a lot of magic power and rarely uses <>, so I don't notice it."

"I used to do a lot of digging.

"I've been using digs for a while now, but they're so powerful that you don't even notice the difference."

"Well, more than that, it is unlikely that we can compare the effectiveness of <> and the magical power it consumes.

That's true.

"And since earth magic is limited in its use, we don't compare what would happen if the quality of the soil or stone were changed.

The discussion gradually became heated.

"Reinhard, were there any other applications listed?"

"Yes, there were some, but they were all well known.

"There were some, but they were all things that everyone knew.

Jin recalled the treatment that the had given to the farmlands of the four duchies. He thought that it must have been an extension of this technology.

When he explained this to the others, there was an outpouring of agreement.

"They use it for agriculture. ......"

Hanna had heard about it, but after hearing Jin's explanation again, she began to think about what was going on.

"Magi crystals (magi crystals) are buried in the land and used for various magic <...... hmmm."

She seemed to be gathering her thoughts in a mumbling manner.

Then, when she seemed to have gathered her thoughts, Hannah looked up.

"Hey, <> is a mixture, right?

"Yes, it is. It's a mixture of sand, gravel, clay, and organic matter.

"What if the <> is magecrystal grains?"

"...... might be easier to handle."

"Well, what if there was a way to temporarily increase the content of <> when doing civil engineering work?"

"It would make the construction work easier."

Now we can all understand what Hannah is trying to say.

"If we can fill the area with free magic element (ether) when we do construction work, it will increase the efficiency, right?"

"Yes!　That's what I thought of you."

"Because other magic also becomes more efficient in a place with a high concentration of free magical element (ether).

"It's the same thing, isn't it?"

Hannah nodded with a smile at Jin's words.

"I'm sure it's ....... ......."

Reinhardt said with a wry smile.

"It's a lot more difficult to fill it with free magic element (ether) than it is to build it, isn't it?"

"Yeah ...... maybe so, but..."

Even Hannah, who is not a mage, knows that much.

But the study, the theory, cannot take the cost into consideration.

If it works, then the next step is to find a way to reduce the cost.

"If it is soil, maybe we can spray diluted and let it soak in."

is a synthetic substance made of free magic element (ether) dissolved in water made of magical isotope (magiisotope), and it is an extremely powerful source of energy.

"Hannah-chan, that would certainly work, but the cost is probably not worth it. ......"

"I know. ......"

"No, the cost will go up if you try to use <>."

Hanna's shoulders drooped at Reinhardt's words, but she looked up again at Jin's words.

"Since <> enters between the molecules, we can use an <> to increase the concentration of free magic element (ether) in the surrounding area.

"But it will take some time for the free-magic element (ether) to permeate to the point where it has a noticeable effect."

"Reinhardt is probably right. But with civil engineering work, if we start the process the day before, we can expect a two to five times, if not ten times, increase in effectiveness."

"Indeed."

This is a scene that does not have to be effective in a short period of time, as in a battle, but it is perfect for civil engineering work.

Jin was planning to dig a canal between the Laurent and Rasiel continents later on, so he thought this discovery was a godsend.