human
Produce a detailed written description of a spooky scene outside a cave with a crevice and a stream.
assistant
The brook running from the slopes outside finds an entrance into the cliff face here. Eons of trickling water have worn a fair-sized chamber into the porous limestone. Near the back of the room, the stream disappears into a mossy crevice, dropping to who-knows-what depths below. To either side of the crevice, watercourses long since diverted have washed out even larger openings in the rock.