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,  The group of adventurers, Vox Machina, had found themselves in the Feywild, intent on discovering another one of the Vestiges of the Divergence, one of the many artifacts that they hope will aid them in their struggle against Thordak the Cinder King and the rest of the Chroma Conclave. They've defeated two of the members, three still remain, Thordak being the seeming powerhouse head of that troupe.
DM: Okay. In feeling any source of bodies of water, you're too far from the Gilded Run to sense any of that, and there is no running water within the actual Shademirk. Everything is a very slow-rolling sludge from the direction that you initially sensed. It's this perpetual billowing of slow, crawling death. What little bit of running water you would sense is deep underground, and probably still in danger, over the next 50 years or so, of being corrupted itself.
Player: Oh. Okay. For my last question, can I get a sense on any big evil things that might want to kill us?
DM: You need to be a little more specific than that.
Player: Everything. More specific that I won't screw it up. Are there Twinkies? Are there any more large crocodile dudes living under the-- I don't know. Any more large things living under the swamp?
DM: So you do a sense for large, dangerous plant life entities like that crocodile.
Player: Yes, under the swamp. Well, wherever. Just blanket it.
DM: As you extend your presence, you get no images or any sense of creatures like that crocodile. However, you do sense a rather intense presence throughout this bog at certain places of other corrupted plant life entities.
Player: Does the tree in front of us count as a corrupted plant life entity? And none of the pixies that live in there are showing up on my radar as bad?
DM: No. That's your final question. The spell fades. You climb your way back down out of the branches of the tree.
