It's a fantasy role-playing game.

DM: You are Percival de Rolo, a human gunslinger . You are the member of the famous group of adventurers. Previously, There, they find a cave filled with magical darkness. Keyleth shifts into an earth elemental to scout the cave, finding that it contains a strange planar rift and a group of grick.
DM: It begins to curve about 20 feet in, so you're unable to make much past that distance, and it looks like a continuation of the water flowing through, or into; you're not quite able to tell from this distance.
Player: (singing) Nobody knows what it's like-- (singing) To be a shark man.
DM: (laugh) Percy. You manage to pull from it all the teeth in the process.
Player: For you.
DM: So that comes to roughly 45 cloaker teeth. You don't know what that'll be worth, but you have that at your disposal. So you can write down, "45 cloaker teeth." You manage to skin most of it. You get most of the top of its hide usable. It's still wet. It'll take a while to do that, let alone in an area where it's dry on the surface. But you manage to pull most of the top of it off, so you have this wet, skinned portion of the back of the cloaker at your disposal.
Player: I'm going to build a relative canopy specifically for the left side of the boat so that we're protected and visibly obscured from anybody in the city.
DM: Okay. Make a tinker check.
Player: What's the bonus on that, again?
DM: Well, for that, it should be dex, I believe.
Player: Dex, thank you. (raspberry noise)
DM: Plus four, because you're proficient with it. So it's your dex plus your proficiency modifier.
Player: That's 11.
DM: 11?
Player: I rolled really badly.
DM: Yeah, you did. You still have the hide. In the time it takes for you to get to the beach, you don't have much material at your disposal, and to fashion anything that's on that side, the most you manage to get is a slight lift to it, and by the time you get to the beach, it just collapses on itself.
Player: Okay. Once we're at the beach and we have all evening, I'll make another attempt.
DM: Okay, it'll take you some time. It's doable, but it'll take a while.
