Early in the morning, we returned to the Royal Capital using the skeleton carriages, with the same amount of members that we left with.
It would have been strange if the amount of members we returned with was different, but this isn't really a problem since the main force has already hidden in the Royal Capital's underground area.
Osvel is a relatively advanced city in this world. The citizens are able to live conveniently because they spent a lot of time and money to build an underground water supply and a sewer system, with guidance from the 【Sage from Another World】.
For that reason, it's no longer necessary for them to draw water from wells or rivers, since they can simply turn on the faucet for fresh water that can be immediately drunk. The restrooms which are the type that are flushed with water aren't understood, though.
However, he honestly wanted to make a simpler structure, but the Royal Capital was very large and had many buildings that were already completed. It seems that the 【Sage from Another World】 did not have much specialized knowledge himself.
They were both set up underground with steady effort, and as a result of delicate curving and even slight mistakes, a complicated path was made which was similar to a labyrinth. It was so complex that if an unskilled person entered it, they would get lost without having a clue where they were.
On top of that, it's quite dangerous since there are monsters, including several species of rats, that have settled in there and can show up out of nowhere, such as:
"Iron Rat," a rat that's approximately the size of a small dog, with hair and teeth that are as hard as iron.
"Chain Explosion Rat," a rat that is harmless, but has a troublesome trait where they will gather into a group if one of them is killed. When one is killed, they set off a small explosion that will cause a chain reaction if nothing is done to stop it.
"Bugs Rat," a rat that possesses the distinctive traits of various bugs, such as a hornet's stinger that has a powerful poison and a bombardier beetle's ability to release high temperature benzoquinone gas.
"Trash Slime," a slime that grows by taking in garbage and sewage.
"Trash Mamba," a monster that's covered in filth and swims in the sewage.
And so on...
However, even though they're dangerous, these monsters prefer the darkness, so as long as their numbers remain low they are unlikely to appear above ground. There's been no evidence up to this point of a resident of the Royal Capital being attacked by these monsters, so long as they don't enter the underground, that is.
For that reason, the general public is never allowed to approach the underground complex.
Having said that, it's not a particularly uncommon occurrence for children that are playing to enter the underground, only to later be discovered as corpses or pieces of meat. It also appears as though abandoned and unwanted children are often left there on purpose.
Normally, only adventurers enter the underground, since they regularly receive requests to exterminate the monsters there to keep their population down.
It's a very welcoming place for those people doing shady things, though.
On top of gathering the abandoned children like they're pieces of merchandise, many scoundrels have made their homes here so they can perform many illegal activities that can't be done on the surface.
Organizations of various sizes have hideouts in every sector and they're usually at peace with each other because of an agreement similar to a scoundrel's pact. It seems that there are periodic turf wars every few months, though. This makes the dangerous underground an even more dangerous place, but lets ignore that for now.