It's a fantasy role-playing game.

DM: You are Vex Vex'ahlia, a half-elf ranger . You are the member of the famous group of adventurers. Previously, As they wake up after their rest, you detects, with the last, fading trace of her Hunter's Mark, that the duergar queen is on the move out of the city. They break camp and start after her.
DM: Go ahead and make a tracking check, so just go ahead and roll a d20. You have advantage, because you're in the Underdark.
Player: What do I add that to?
DM: It should be under your tracking ability under your ranger abilities there. In your spells, under you ranger abilities. I'll see if I find it before you.
Player: I don't understand.
DM: It's on the sheet I gave you, with all your character stuff.
Player: Oh. Okay, cool.
DM: That one. The one that's easiest.
Player: Natural explorer, primeval awareness.
DM: Okay.
Player: I don't have any idea what I'm looking for. (all laugh) I'm just looking at words right now.
DM: It's a survival check. There you go.
Player: It's a survival check.
DM: You have advantage on it.
Player: Okay. Oh, good. So that's 22.
DM: 22. All right. Looking around, what you do find is, there is a very familiar scent that a goliath barbarian does have. You, using Trinket's help, as you yourself are not quite as attuned, Trinket does pick up a little bit of Grog's scent in this pathway. So Trinket (moans) gives you a nudge and points deeper down the cavern. And you can see what looks to be a smattering of small duergar-sized feet and two grooves.
Player: Two grooves?
DM: About two-inch-wide grooves that continue down the path.
