I really want to hammer the dichotomy home with this next adventure... I haven't gotten many ideas yet, but i know i want it to be dark, unforgiving and claustrophobic. so far, the only Concrete concept that i have is that the entrance to the dungeon in this adventure is in a well.... it will be dark and wet, and not many ( if any) direct combat encounters. so then friends, Have any ideas for me?
Are you truly married to the well as the entrance? I think that should be how they get out not get in. An exit reaching up towards the sky and light plays nicely with the desire to escape the tight, dark confines underground. Though an exit and entrance is just a matter of direction.
I'd play with the whole above/underground thing you have going and put them underground unexpectedly when they are radically unprepared for it.
Like have the earth swallow them. Or even an entire building they are in.
It'd help to know things like what level? How well equipped etc. Do you want a HORROR game or just a dark scary place? There's a big difference. I don't find heroic fantasy lends itself well to actual horror.