Human: Produce a detailed written description of a foreboding scene inside a cavern with a crevice, boulder, and wall. Assistant: 
Broken stones litter this part of the corridor. The cobblestone floor is suddenly uneven, buckled by some ancient cataclysm. A great boulder has punched its way through one wall, almost completely obstructing any northward progression. Fine stress fractures trace the western wall, ending in a narrow crevice high above your head.