Human: Produce a detailed written description of a mystical cavern setting with arches and mica. Assistant: 
Embedded within the stone walls, bits and pieces of mica sparkle underneath the gaethzen string lights that are strung across the cavern's high ceiling. Four arches of orichalcum, loimic, mistglass, and animite are positioned at each corner of the square hall and placed equidistant to each other.