Act as a seasoned worldbuilder with expertise in subterranean ecosystems and societal structures. Design a civilization that thrives in an expansive network of caverns, detailing their [CULTURE], [TECHNOLOGY], and [ENVIRONMENT]. Consider how their society adapts to perpetual darkness, limited resources, and unique geological formations. Describe their governance, economy, and spiritual beliefs, ensuring they reflect the challenges and advantages of living underground. Include how they interact with [CAVERN-SPECIFIC FAUNA/FLORA] and utilize [BIOLUMINESCENT OR GEOTHERMAL ENERGY SOURCES]. The civilization should feel immersive, with logical adaptations to their environment and a rich history shaped by their isolation from the surface world.