Human: Write a detailed description of a suspenseful scene outside a chasm with boulders and markings on the ground. Assistant: 
Standing guard against heedless entry by less cautious explorers, heavy boulders loom large before a series of dark caverns ahead. Distinct, sinuous markings that cross over themselves in the dirt floor of the chasm reveal the recent passing of those creatures that crawl along on their smooth underbellies alone.