Dungeon Builder: The Demon King'S Labirinth Is A Modern City
Chapter 7: The Underground Prison without the Demon King

I gave Tenko the gun she wanted and immediately taught her how to use it.

It seemed like he was very happy with the gun when he tried to test his shot. He went on about how he wanted to use it in a live fight.

So Succubus moved us once more. This time, to the 68th floor. D rank monsters look like they are not enough for us, so we head to the Maelstrom that produces C rank monsters.

"What the fuck, how many floors are there?"

"All in all, one hundred and one."

"A- !?"

It was beyond what I imagined.

I didn't expect for more than a hundred floors.

“That's because [The Beast] Demon King Marchosias is one of the great old Demon Kings and has ruled for almost 300 years. Moreover, he was also a very hardworking person. By the way, he also had around 1500 monsters. ”

“It was much more than what I imagined. I shivered imagining we were fighting. ”

It was obvious but the power I commanded right now was incomparable to his strength.

Marcho would probably beat me for no reason even without sweat.

“Oto-san, don't worry! I'm here anyway. I'll protect you!"

Tenko clung to my arm and raised an energetic voice.

He said it but 1500 was too much for him.

“Fufufu, energetic and kind child. As expected of an S rank monster, even after being told such things. But rest assured, [Creation] Demon Lord Procell-sama, he has no ill intentions towards you. After all, your training is his last major task. ”

"last?"

I noticed those words.

"Oh, you've never heard of it?"

The Succubus looked at me with surprise all over his face.

"No, I haven't heard anything."

“Isn't it .. In that case, I don't know if I should tell you. Apologies, but it's a secret. "

Succubus quickly lowered his head.

I showed him that I understood but Tenko seemed to be dissatisfied with it.

Tell us, tell us , Tenko pestered.

Succubus smiled bitterly but then, it seemed like he finally gave up a little.

"Just a little, okay?"

When he said those words, the voice of a girl who should not have been there sounded.

"No need for that."

The space in front of me changed and then, Marcho was there.

“Really now, it's a good thing I checked your group. Succubus, I can't say I agree to speak as you wish about important and personal matters. "

"I-I have no excuses, Marchosias-sama."

“Well, it's okay. It's not like I forbid you to talk about it. I'll let him consider your general performance. "

Succubus slowly lowered his head and Marcho smiled wryly.

"Can you also use transfer magic?"

“No, I can't use high ranking magic like Succubus. After all I am some kind of muscular Demon King. It's more like using my authority as a Demon King. I can jump to any place I want as long as it's inside my Dungeon. ”

It is a comfortable ability.

I will take note of it when I create my Dungeon in the future.

"But peeping is an unpleasant hobby, you know."

“I'm worried so I check. By the way, it's through Succubus. You better remember this but Demon Lords can share senses with up to a hundred monsters. I have done it with almost all the leaders on every floor. ”

"Then, I should refrain from uttering a bad Marcho in front of Succubus."

“Not just in front of him. You can never be sure where my eyes and ears are very careful. Being in a Dungeon was like being inside a Demon King himself. ”

Yeah, most likely like that.

Sharing the senses.... It seems like I better try it once with Tenko. Can we share our five senses? If we can, then ……

"Oto-san, did you think of anything strange?"

"No, there's nothing like it."

Tenko was as sharp as ever, but somehow I tricked her.

I then turned towards Marcho and he started talking to me.

“I'm telling you this because this is also important information for you. Succubus has started talking about it but, you know, we Demon Lords have a lifespan. ”

"Living time?"

"Yes, life span. Three hundred years to be exact. If that much time had passed after one became a Demon King, then that Demon King would have vanished. By the way, I'm 299 years old. ”

I gasp.

He looked very healthy, but he didn't even have a full year.

“Hey, don't make that face. I've done everything I wanted to do; I have no regrets. And I've raised you as my last assignment. The training of the newborn Demon King, you see, a task given to the Demon King that was nearing the end of their lifespan. Once in ten years, all in the same day, ten Demon Lords are born which also means there are children besides you. Perhaps this was a favor because this task was given to the old Demon King because if the young one did it, it would be a good one, then they would see the newborn Demon King as a rival and thus would not be able to honestly teach them things. ”

His words about not regretting anything don't seem to lie.

And then, if the thing about there being ten of us born at the same time is true, then there are nine others in the same group as me.

"I understand about our lifespan, but if you are going to die, what will happen to the monsters you left behind?"

I asked a question as I held Tenko's hand.

I had been taught in the beginning that if my crystal was destroyed, my monsters as well as the Dungeon would vanish. Then what about when the Demon Lord himself disappeared?

“Nothing will happen to them. The Demon Lord disappearing had no connection to the Dungeon and its monsters. They will continue to exist as long as the crystal is. Instead, the crystal would mimic the behavior of a Demon King when he was alive and would randomly and unconditionally make monsters use DP. Crystals would continue to do so irresponsibly over and over again, so new monsters would end up fighting monsters that had been created before. Well, pre-existing monsters would also fight each other. No longer under anyone's orders, they would do whatever they wanted. It's total chaos. ”

A monster free of orders is just a bad premonition.

“Monster that lacks intelligence is very bad. A monster that had some might establish order with a fellow thinking monster but if a monster that could not think had a larger number, then everything was in vain

A Dungeon that no longer had a Demon King was probably a very difficult place to inhabit all of its monsters.

“Well, after I leave, my [Monsters of Covenant] will be entrusted to others. The monsters will be free. They could create a new order in the Dungeon, rampage as much as they wanted, or even go outside. Until the crystal breaks, all they have to do is live fully. "

"What happened to the monsters that went outside?"

“Many of those children were subdued by humans. And sometimes, that action was connected to the end of the Underground Prison. Humans will become serious and a massive Dungeon conquest will begin. Humans had a large number and were also beings called Heroes, beings on the same level as Demon Gods. If humans became serious, no one would be able to win against them, especially a Dungeon that did not have a Demon King. "

That's a natural conclusion.

Monsters that go outside and injure humans will make them angry. And then, humans might also know the fact that those monsters would be erased as well if the crystal were to break apart. One should always try to cut evil at its root.

In the absence of a Demon King, the Dungeon's defenses would drop, and in the end, the crystal would be destroyed and the Dungeon and its monsters would cease to exist.

"By the way, do you remember that I told you about teaching you a better hunting ground than using Maelstroms?"

"Of course."

Actually, I was really looking forward to it.

Maelstrom would create monsters only once a day. Moreover, I was only allowed to hunt monsters from two D rank Maelstroms and from one C rank Maelstrom.

In order to raise our level as well as the DP I have, I want a good hunting ground.

“That's what I just taught you. A Longer Dungeon had a Demon Lord and had fallen into chaos. You can freely hunt monsters there. After I leave, you can do the same in this Dungeon. ”

I shook my head.

As expected, even when I was told that I could do whatever I wanted with the monsters here, I would hesitate.

I don't mind doing it with monsters that don't have the intelligence of a Garm but for those that do, like Succubus, I can't say the same.

And then, the man opened his mouth.

“Marchosias-sama, we will not allow that. Even after you leave, we will still continue with our main objective and isn't this protecting this [Demon Beast Castle]? We will continue to do protect the Dungeon that the great Demon King Marchosias-sama has built while punishing the mischievous children! We will not bring disgrace to you or allow anyone to do so. "

There is passion in his words.

I was a little envious and wished I had a subordinate like him.

"Is that so? Is it ... Geez, you kids are useless to me. "

Marcho showed a smile.

His popularity, which he definitely gained himself, made the succubus say such things.

“I'm lucky to have subordinates like them, but not everyone is so lucky. [Crimson Cavern] I plan to show you is a Dungeon where all monsters that possess intelligence have died or been left behind. All that remained were mindless monsters rampaging with their hearts content. The only reason it has not been destroyed is because it is quite far from human settlements. "

[Crimson Cave].

Hearing that name reminded me of [Fire].

Could it be that the [Fire] medal I received came from the Demon King who used to rule in that Dungeon?

"I certainly don't mind hunting those useless monsters."

It would definitely be difficult if the enemies were monsters that had intelligence and reason like Succubus but when they were such mindless monsters, I had nothing to doubt.

“You better not get ready. There might not be any high rank monsters created by the Demon King himself but still, among the monsters that were constantly made by crystals, C rank monsters were all over the place. ”

"Then, it looks like I'll set it up."

Monsters as high as two ranks lower than those that had been created in synthesis before could be purchased using DP.

And unless one had the [Creation] medallion ability, they could only create up to monster rank. So that meant that the crystal could only create monsters up to C rank.

However, Marcho groaned.

“But Tenko doesn't match that place. His specialty used fire attacks but almost all of the monsters there had high fire resistance and many were physically durable. If none of you can use water magic then you need to unleash an extremely powerful attack without the Flame attribute in it but at your level, it is quite difficult. ”

“What, there's such a thing, huh? You don't have to worry, we don't have any flaws in the attack department. Tenko, show Marcho the power of the weapon I made some time ago. ”

"Yay! ♪ ”

Tenko prepared a weapon.

It was a weapon I just made some time ago using [Creation]. It was a weapon according to my interpretation of Tenko's request that he wanted a melee weapon with a big explosion.

It looks like a rifle.

The Remilton M870P

Length: 1060mm

Weight: 3.6Kg

Caliber: 12 gauge

Magazine size: 5 + 1 round

The strongest gun for close combat.

Note: For magazine size, +1 means that the sixth one is in the barrel of the gun.