Act as a seasoned worldbuilder with expertise in dystopian and speculative fiction. Craft a detailed post-light world where darkness has become the permanent state of existence after a cataclysmic event [EVENT_NAME]. Describe how society has adapted to this eternal night, including [SOCIAL_STRUCTURES], [TECHNOLOGICAL_ADAPTATIONS], and [CULTURAL_SHIFTS]. Explore the challenges faced by inhabitants, such as [MAJOR_CONFLICT], and the myths or religions that have emerged to explain the absence of light. Ensure the setting feels immersive, with unique flora/fauna evolved for darkness and a tone that reflects [MOOD_TONE] (e.g., eerie, hopeful, or desperate).