Human: Write a concise location description of a depressing scene outside a cave with rubble and boulders. Assistant: 
What was once a large cavern, roughly spherical in shape, has collapsed into formless heaps of rubble. Unlike its brethren to the north, there is nothing of graceful arcs and curves here. Only hard and brittle boulders of dull grey and black rock, jagged and misshapen lie within view.