The elves actually patrol regularly to check for places with too much magical energy buildup, but they can't cover every ground with their limited number. Humans just being humans, too busy with politics and warfare until the shit becomes too big to ignore.
It's not even that, I think this fog hides itself until it can take a body, then if it can control itself it can grow more powerful. Also, I'm not sure exactly how long elves live in this world. I'm pretty sure it is like a couple hundred years or so, but like LotR elves, or D&D elves, that can live for like 800+ years or more. But you are right about the humans not noticing until it bites them in the ass.
It sounded like her brother and crew came to the same cave tho. I might be misunderstanding tho
No, you are right, it was this cave, but the monster was different last time, so it is like the fog formed another race for them to fight.
thanks for chapter
pls no another waifu, let others get one!
She would be an excellent addition to the harem. She is stunningly beautiful.
The duality of Man, everybody.