Ohhhhh, a spawn point..
I remember Mathias from "Shikkaku Mon no Saikyou Kenja", he makes a spawn point area takes advantage of.
Instead of breaking the spawn area, he study what kind of monster spawns there.
When he learned the monster are generally weak at high temperature flame, he invent a continuous flame generating magic stone casting technique.
Then the spawn area which is generally in another floor, what they do is go up one floor higher, and bore a hole. Then do the continuous high temperature flame and just wait.
Its the free experience for level up without much doing unnecessary work. Its basically an exploit in the dungeon system.
I wonder if that is applicable to this swamp....