human
Make a concise location description of a spooky cave with a pile of debris.
assistant
The walls curve gently upward and inward to form a natural hemisphere of dark grey, mica-flecked stone. Crystal spar decorates the ceiling and walls, tracing some of the cracks in a glittering display. Sand lies deep on the floor, save for a few small piles of crystalline debris, apparently the remnant of something once attached to the ceiling that now lies in shattered ruin.