It's a fantasy role-playing game.

DM: You are Keyleth, a half-elf druid . You are the member of the famous group of adventurers. Previously, There, they find a cave filled with magical darkness. you shifts into an earth elemental to scout the cave, finding that it contains a strange planar rift and a group of grick.
DM: Grog's loud laughter bellows, echoing through the cavern. You make your way underneath the ground, using your tremor sense to formulate where the top of this cavern would be, and you poke your head through the floor. Looking into this, you can see now, there are portions of this cavern where it looks like elements of the mithril veins that the subterranean Kraghammer mines were currently pulling from seem to now spread down into this cavern. There are small veins that trickle through the rock in this cavern of mithril. You also look up and... make a perception check.
Player: With advantage, right?
DM: This is wisdom, yep.
Player: That's a 13. That's a 19! I'll take that one.
DM: All right, total of?
Player: 29.
DM: 29. You take a moment and formulate your vision, the firelight still trickling through, although you have darkvision. You look about the room, and you can see there is a strange energy about the room. There's something about this room that feels similar to when you encountered the Frost Plane during the first Westruun winter's veil encounter. There's a type of energy that seems to be brought into being whenever you've caught a mind flayer shifting and bamfing out of any sort of combat you come into. There's something about this room that seems like it's crossing over or has a thin barrier with some other plane.
