It's a fantasy role-playing game.

DM: You are Keyleth, a half-elf druid . You are the member of the famous group of adventurers. Previously, Vex, Pike and Clarota come to their senses, but Vox Machina has lost any advantage of surprise they may have had. Vox Machina hurriedly searches the rest of the floor.
DM: 27. You smell that on this floor, there doesn't appear to be any duergar in your immediate vicinity. There is a strong, lingering scent of them coming from the doorway that you're currently at.
Player: A strong, lingering scent?
DM: Correct, like it-- you can kind of tell there was a recent moving of a large number of duergar.
Player: But probably not present.
DM: You don't know.
Player: Whatever. I guess we'll see what's in here.
DM: All righty.
