Editing Isan Reni (section)

=== The Underground ===
Beneath the surface lies a vast network of natural caverns, many lined with crystalline formations that refract and amplify the faint light filtering down through the fissures [1]. Entire cavern systems are illuminated in pale blues, silvers, and faint golds, the light shifting with the rotation of the moon relative to Elgo Gey [1]. The overwhelming majority of Isan Reni's population lives here [1].

Over millennia, the cavern systems have been expanded, connected, and shaped into a sprawling subterranean civilization [1]. Great halls have been carved from crystal [1]. Debate chambers are designed with natural acoustics that carry a speaker's voice to thousands [1]. Rivers of mineral-rich water flow through engineered channels, providing both sustenance and the eerie, resonant hum that gives the underground its distinctive atmosphere [1]. The crystal caverns are not merely shelter — they are the architectural expression of a culture that prizes clarity above all else: transparent, luminous, and unforgiving of shadow [1].