I like the idea of the condor-sized bat snatching up small prey on the desert at night, though the web spit doesn't really fit with that - the bat would actually need to land to extricate its prey from the webbing.
I like the feel of this place - it even calls to mind some of the Game of Thrones locales, though the inhabitants are far more hospitable. I see this area being a critical pass between populous regions.
A good place to stage a murder mystery, plague, Alienseque monster invasion, etc.
Good trap, though things like 'no escape' bother me. All illusions, the product of fallible mortals, can be broken with sufficent spellpower or other attributes/resources. Extremely Difficult, yes. Impossible - no. Go to Comment
The heroes find the crumbling, overgrown ruins of what appears to be some sort of grand dining hall in the forest. Deciding that it is a good place to camp, the set up a fire in the center. However, they are woken in the night to see skeletons waltzing in the moonlight to organ music that emanates from the open air. The skeletons touch nobody, dancing around them all night.