A couple of very large dracolich statues with nose holes, dropping the green slime(s) upon the hapless victims if they trigger the trap to release the slime from the chambers within the statues that held them.What's the best use of green slime as a monster or hazard that you've ever seen or read?
For my opinion, I think the green slime hidden under a couple of feet of muddy water in White Plume Mountain was clever. Evil, cruel, even arguably unfun, but clever.
Bullgrit