I was looking for a gem to put in that
Book of Dentistry I found earlier. I had to sneak around a
huge phase spider to get it, but I managed.
As I left, I wondered about that encounter. There were four web bridges set up around the edges of a deep pit with green light coming out of it. Would it be possible to push mama spider into that pit? I checked online and... yep! But you lose her treasure. But wait, a note said you can get the treasure from her corpse, which you'll find in the Underdark! Ooooo! The first D&D module I ever bought was Vault of the Drow, so I'm excited to see that!
I went back, fought the spider and her helpers, died a few times, reloaded a few times, and eventually managed it without pushing her down the hole. Then I saved game with a good, memorable save name, got everyone on a web bridge, cast feather fall, broke the bridge, and down we went! I spent a lot of time down there, sneaking around, completely outclassed by the enemies. I didn't find a way back up, but I was able to fast travel to get back above ground.