PlayerMob

This is my first post and my english isn't very good, so tell me if I did any typo or something like that.

I'm making a campaign where a evil cult has a secret ritual that transforms part of any place in a mystic place, dungeon-like, and they used that spell in a hot springs facility located in a desert for plot reasons. However, I'm lacking ideas for puzzles for that.

Can someone help me with that?

I'm trying to write a light novel that isn't on the hero from the other world POV. Should I say things that people might not understand in first place to answer later, like phenomena that might happen and city names and Epiphets without even telling about how the world works?

Also, should the Inspect Skill be something that not everyone have?

I don't remember, it was a music that i first heard in 2017, so I don't have any clips of that. All I remember is that it has a black and white, sketch comic style, that it has two teenagers masked in high school, they were talking about society and something like "Curse you, PDA", even though i don't really remember the lyrics more than it has a lot of "PDA". Even though I don't have a lot of info, I have an image about one of the guys. I tried to find with it, but it didn't helped me. Please, I really need to know.
https://imgur.com/a/ibOPuIT

That's an old project that I made some time that I didn't felt that it would be recognized as something good. When I found this subreddit, I thought that was the perfect place to say about. Anyway, I hope you like it, enjoy.

Synopsis

Katsuo is a half-demon who lives with his parents in a village near a forest where he hunts monsters with his fishing rod. This world is a place where adventurers from another world occasionally appear, although no one knows why, and Katsuo is very fond of his culture, although Katsuo never had the courage to speak to someone like them.

However, in the middle of one of his hunts, Katsuo hears a girl's cry. Worried that the girl is in danger, he runs towards t