What is called a tree dragon in a tree dungeon is not a real dragon. They are tree monsters that resemble dragons.

　This tree dragon has sturdy vines from all over its body.

be hanged (by the neck)

The vines seem to extend in all directions and use them as a whip to attack the enemy. Moreover, the vines have poisonous thorns.

I recommend attacking such demons from a distance to defeat them."

So, we're talking about long-range attacks on large demons, which would be "Crashball II," "Torpedo," "Descrescent," and "Projectile Barrel."

The question is whether tree dragons have the ability to sense D-particles."

We'll have to deal with the assumption that it's there. Then they will use the myriad vines like whips to try to knock down anything that comes near them.

In such a situation, the 'projectile barrel' might be a good choice. Other magics will explode or radiate spatial vibration waves when the whip hits the target."

'Well, I guess it's a flying tank after all.'

　Metis and I pooled our wisdom and decided on the general structure. It would be a combination of a part to be fixed to the magnetic barrel, a shell feeder, a sighting device, a shield to protect the gunner from blast and shock waves, and a small hover-vehicle to float and move them around.

　Based on those structural plans, we placed an order to a factory that manufactures artillery shells. This factory was selling that it could make anything, and was manufacturing vehicles and ships for adventurers.

　Later, the "projection barrel" was also modified a bit. They made it move with the flying ammunition feeder.

　We called it a flying tank, but since it is not armored enough to be called a tank, we decided to call it a flying cannon or hover cannon.

　After the hover cannon case was settled, I invited Alisa and her colleagues to the mansion to study the white magic stone.

　Alisa and the others gathered in the workroom. The workroom is a comfortable room with lots of sunlight and couches and tables brought in.

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　Toshizo, the butler shadow puppet, brewed a pot of tea and brought it to me.

Thank you."

　When Alisa thanked him, Toshizo gracefully bowed and left the room.

Toshizo is becoming more like a butler. It seems that Kongoji-san is training him well.

　Amane raised her voice. Chika and the others agreed.

　I took a sip of tea and then explained about the use of white magic stone.

I didn't know the White Magic Stone had such a function. How exactly do you plan to use it?"

　After hearing Alisa's question, I start talking about what I'm currently thinking.

First, we're thinking of building a device to store and emit the D-particles."

Are you suggesting we build a D-particle collector?"

　Chika confirms.

Yes," he said. I checked to see how much D-particles the White Magic Stone could absorb, and found that it was almost the same as a D-particle collector."

I see. Then the D-particle collector might be made of white magic stone . ......"

　Interrupting Alisa's words

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Amane leans forward and raises her voice as if to say, "I'm sorry, I'm sorry, I'm sorry, I'm sorry.

'Sir, please tell me the conditions under which the white magic stone absorbs and releases D-particles.

When adventurers use it, they should pour magic power into it while being aware that they are absorbing D-particles. Conversely, when emitting the D-particles, you must pour in the magic power while being aware that you are releasing it.

　Alisa and the others look at me as if they don't get it.

But when you use a D-particle collector, you don't think about that."

　I nodded to Amane's point. There are two ways to use white magic stone, and I believe that the D-particle collector has another use.

　It is to change the wave of magic power that is poured into it. It seems that magic power has something equivalent to the frequency of radio waves, and if you adjust it and pour magic power of a specific magic frequency into a white magic stone, you will get the same result.

　Amane's eyes lit up when she heard this story. However, creating a magical tool that adjusts magical frequency requires advanced technology, and Amane is not yet able to create one.

Well, I'll have another magician make that part, but I think I can make a D-particle collector.

　I said, and Alisa and the others nodded.

The question is, how do you develop a magical tool using white magic stone?"

I thought about something like a light that uses luminescence or a stove that uses heat radiation. ＜I thought about something like lighting using luminescence or a stove using heat radiation, but I came to the conclusion that it was not something that could be made using something as precious as white magic stone.

　Yukari raised her hand.

Yes, I think it would be a good idea to generate electricity using the discharge.

I agree. The D-particles floating in the air are used as fuel, so it seems to be very cost-effective.

　I tilted my head.

But the amount of D-particles in the air is limited, so the amount of power generated can't be that great, can it?"

　Yukari smiles.

I heard that the density of D-particles is higher in the ocean than in the air. What about collecting D-particles from seawater?"

　I heard that there is also a type of tidal current power generation, so if it is installed in a tidal area, it may be able to generate a considerable amount of power.

I see. The idea sounds good. Let's build an experimental apparatus and check it out. Any other ideas?"

Could we develop a clean room where we could make the integrated circuits that were developed when D-particles didn't exist?"

　Alisa came up with an idea.

'I think that would be difficult.

　Métis makes a no-no. Alisa and the others reacted with a startle to Metis' sudden remark.

Why do you think it's so hard?"

The reason is that the technology for integrated circuits has been lost. It will take trillions of yen, or even tens of trillions of yen, to revive it.

It doesn't have to be that serious, just something on a laboratory level."

　Alisa says, Metis says that might be possible.

'But D-particles can come through walls and soil, so I think we need properties that reject D-particles.'

　Alisa and the others all turned their gazes on me at once. What, am I creating new characteristics?　Huh, I don't like pain.