It's a fantasy role-playing game.

DM: You are Taryon Darrington, a human artificer . You are the member of the famous group of adventurers. Previously, They make a circuit of the volcanic cone, finding a small hole that Grog is able to punch wide enough to admit all of them. They navigate their way through a combination of air- and water-filled tunnels, using water from Grog's Alchemy Jug to breathe through the sections that have only deoxygenated air.
DM: You glide down your own way. The air is extremely warm as it passes by you. Holding your breath at this point, because you are not near any source of water, it looks like, and you're not carrying one with you. You glide down, rapid speed past the lava, which eventually comes and cools in a clump, a small mound where it seems a recent hole punched out of and began to dribble down. It's been cooling and causing this extra layer on the tunnel. Everything here seems to be in this weird state of flux. You continue past it, and it drops into a tunnel below, maybe about 20 or 30 feet wide. Descends downward.
Player: Straight down?
DM: Straight down.
Player: I'll go down a bit.
DM: You descend about 30 or 40 feet. This cylinder-like tunnel comes to a halt; it stops.
Player: Am I detecting any evil?
DM: You are not detecting any evil, no. Do you have darkvision in this form?
Player: I don't know! Where does it say?
DM: It says truesight. You don't have darkvision; you have everything vision.
