It's a fantasy role-playing game.

DM: You are Vax Vax'ildan, a half-elf rogue . You are the member of the famous group of adventurers. Previously, With that, the two ghosts flee into the nearest wall. With two of their members now severely hurt, the party decide to take a short rest, Keyleth preparing a Heroes' Feast for them while they sit.
DM: As you look inside, you walk up to the liquid. It looks like there is a very slow flow to it, coming at an angle. It's very thick and looks like it's melted through the basis of the floor and almost like it would continue under, around, and out of this room into whatever is beyond. You get a feeling there is something to why this part of the prison was probably abandoned.
Player: Wait a tic. Wait a sec. I back out slowly, and I'm going to creep back to the other door. That other one, yeah. Perception check there, as well. That's 16.
DM: Okay. The door is not currently locked.
Player: Okay, and does that count for the traps, as well?
DM: Yeah, it's not trapped, either.
Player: Okay, so I'm going to open it an inch and see what I can see.
DM: Look inside. There is a large collapsed pile of rubble. Whatever this room once was has entirely collapsed on itself. You can see, it's pushed up against the door. Something made this room inert, and it's not currently functional.
