This dungeon was called the skeleton crypt. It sounded like a gathering place for undead-type monsters, but that was not the case.
The warlocks, who were willing to explore, had already figured out the monsters that occupied this place. They were all groups of pythons!
It was extremely difficult to encounter so many pythons in the prime material plane or other places in the multiverse. First of all, these creatures had long been on the verge of extinction. Sometimes, you could only find some mutated pythons in the astral world, but they were already very different from their original pure bloodline.Secondly, the Pythons themselves were not social creatures. Most of the Pythons would have a very strong sense of territory after they grew up, and it was normal for them to not interact with each other.