A 10' Pit Is Supposed To Suck
Brogg, okay you do some dmg. Miss on the crit fumb.
Schmektor, you collapse on the ground in a very unheroic manner. Two more Gremlins leap onto you, one hitting for 5 hp, make a save vs. poison now. You can make a WI check (roll a d20 and get <= your wisdom) to recover from the fear each round.
Tut, there's a lot of cool stuff going on up over your head, but the pit is pretty dull. Nothing in the accountant's diary talks about slime gremlins.