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, Though the armor was originally Vax's, Vex claims it before he can take it back.
DM: There are pockets here and there that are interconnected, but there are multiple veins of it going through the entire.
Player: What kind of liquid is this lake made of?
DM: So, as you approach, the hard stone surface you guys have been walking on in the tunnel begins to give way to like a coarse sand, almost like a gravelly shore. And it appears to be fresh water. It's clear. The smell is a little musty, but not too bad. And you approach, and you can see there's just these very gentle, very soft waves that occasionally lap up on the shore, but only a few inches. There's not a whole lot of motion to the water within this cavern.
Player: Can we see to the bottom? Is it that clear?
DM: Yeah.
Player: I've got an idea. I'm going to find a small rock-- Oh, go ahead.
DM: I'll finish my description. (chuckles) So there's this lake circling this large island across the way. You also see on this side of the shore, central, there is a large stone bridge that arches over the lake and makes landfall about roughly 200 feet on the other side, at the very, very tip closest to you of this island. It's about 15 feet wide this bridge, maybe 20 feet, and is an immediate walkway onto this island across. You can see just faintly on the edge of this island a glowing bioluminescent fungal forest that covers a large portion of this island's top side. The edges of it, you can see, rise up into cliffs that have eroded over time and are rather stark in places.
