The Endless Caverns, a region of the Underdark in the Lunaris Sanctum, stretch out in an intricate labyrinth of caves and tunnels. This subterranean expanse is shrouded in darkness, with bioluminescent fungi casting an eerie glow on the walls. Scattered throughout the caverns are fragments of ancient ruins, hinting at a long-forgotten civilization that once thrived here. These ruins, with their cryptic carvings and decaying structures, offer tantalizing glimpses into the past. The air is thick with mystery and the constant sound of dripping water, creating an atmosphere of both wonder and danger for those who dare to explore its depths.