Returning to the mansion, I considered how I would fight Saijo and the Aqua Dragon, remembering their battle.

'Are you thinking of Aqua Dragon?'

Yeah, because this is a big opportunity."

I still don't think "Torpedo" alone will finish off Aqua Dragon."

　I thought that might be the case, too. The "Torpedo Dough" was very powerful, but the hit rate was poor. There is an idea to strengthen the eyesight, but if they dive underwater, the hit rate will be even lower.

I suppose you are suggesting that we create magic that incorporates the new property of 'spatial vibration,' but I don't understand what happens when we incorporate the property of 'spatial vibration.

If so, I think the only way is to create a simple magic that incorporates and try it out."

I guess so. I'll try that."

　Metis and I discussed what kind of magic we would make as a prototype. As a result, we decided on a magic that would send a spherical mass of D-particles flying, just to test its power.

　The shape of the D particle is like a softball, with three incorporation characteristics: , , and .

　＜The living magic created just to test the power of "spatial vibration" has been completed. It has a range of 200 meters and a flying speed of about 170 kilometers per hour.

Where would you try?"

Why don't you just go to a pay-what-you-want practice?"

　I responded to Métis' question with the first answer that came to mind.

I don't know what kind of effect has, so I think it's better to be in a place where there are no people nearby."

　I think Métis has the best understanding of , so I will follow his lead.

Let's go to the eighth level of the Narukami dungeon. No one is paying attention there."

　Since the appearance of the aqua dragon in the sea area on the third layer, there are almost no adventurers in the eighth layer because more and more adventurers are trying to get to the aqua dragon before conquering the eighth layer.

If you spot this tale on Amazon, know that it has been stolen. Report the violation.

　I went to the Narukami dungeon and headed for the transfer room on the first level. From the transfer room, I moved to the fifth level and took the shortest route down to the eighth level.

　We proceeded in that order, with me following behind Goro to lead the way, and Elmore at the end of the line. This time, we headed in the direction to the right. This direction was supposed to be an unexplored area.

　After an hour of walking through the thick vegetation, we arrived at a place where hundreds of spire-like rocks stood. The spire-like rocks seemed like a good target. Most of the rocks are about 8 meters wide and 20 meters high.

　I put Tamegoro back in the shadows and then start up the sage system.

　A prototype magic was launched at the spire rock from a distance of about a hundred meters. A D-particle vibration ball the size of a softball was formed in the air and began to fly toward the spire rock. The ball flew at a speed slightly faster than that of a strong-armed pitcher and hit the spire rock.

　Since the D-particle vibration ball incorporates characteristics, the effect of is exerted only in the forward direction.

　There was a strange buzzing sound and the spire rock seemed to tremble.

From here I didn't know what had happened."

Let's get up close and see."

　I approached the spire rock to see where the D-particle vibration ball hit.

　When I checked, I found a hole in the rock face a little larger than a softball. Looking through the hole, we can see the view on the other side.

No way. It's about eight meters thick.

Let's go to the other side."

　When I went to the other side, I found that there was an extensive accumulation of sand under the hole.

Is this sand from crushed rock?"

'It is believed that this is so. The spatial structure was so violently vibrated by the spatial oscillations that the rocks that existed in that space were shattered and turned into grains of sand.'

　The power was so powerful that it made me shudder. Goosebumps appeared on my arms and my face became tense. ＜I felt that the destruction caused by the spatial vibration was on a different level from the magic I had seen before.

　It was more powerful than I expected, so I checked to see how much new magic I could learn at my magic level.

I'm not sure if this magic can be mastered at magic level 10," he said. I think I'll register it for adventurers whose magic is this powerful ...... and whose magic talent is 'D'."

'But it is better to register with the Magical Agency only after you have announced that you are a wise man.'

Yes, because I don't want to be on the verge of becoming a Class A student when the government finds out about it, and then the protection program goes into effect and I have to live with a bunch of bodyguards."

　I decided to test the range of the spatial vibration at a place where two spire rocks rise like a V. I wanted to see how far the spatial vibration penetrated the first spire rock and pierced the second spire rock. I wanted to see how far the spatial vibration that penetrated the first spire would penetrate the second spire.

　The moment the D-particle vibration ball hit the spire rock, the hit point reflected light and shined like a beautifully cut diamond.

　The next moment, the buggy sound reaches my ears and makes me feel bad. This sound has the effect of making people uncomfortable. The spire rock is shaking from the impact, indicating the tremendous power of the spatial vibration.

　A large amount of sand spews out from behind the first spire rock, creating a hole in the second spire rock. When we examined the second spire rock, we found a two-meter hole in it.

　The distance measured from the point where the D-particle vibration ball hit the target is about 12 meters.

Twelve meters, that's plenty of penetration, but at about ten centimeters in diameter, it's hard to deal a fatal blow to an aquadragon."

　If you can pinpoint the brain or heart, it would be fatal, but it would be difficult to hit without getting close. Approaching the aqua dragon. It is quite dangerous.

'This is a prototype, so we can discuss the full-scale version in the future. By the way, what do you want to name it?'

I guess, ...... 'dead ball' would be baseball, so I guess I'll go with 'crash ball.'"

　The name was chosen because it was impressive to see the rocks shattered and turned into sand.

　I returned to the surface and gathered information on Aqua Dragon at the Adventurer's Guild. Word had spread of yesterday's battle between Saijo and Aqua Dragon, so it seemed that no adventurers were immediately willing to take up the challenge.

　We need time to consider tactics.