Spirit Orb in an Underground Stone City

Ultra-detailed 3D render of a luminous spirit orb floating within a vast underground city carved from ancient stone. The orb glows with a soft cyan-blue light, with inner wisps and subtle translucency, casting shimmering caustics on damp, polished stone floors. The surroundings feature grand arches, carved pillars, stairways, canals, and distant tunnels, all lined with bioluminescent fungi, glow-crystal veins, and moss. Volumetric fog and floating dust motes create atmosphere. Use global illumination, subsurface scattering in the orb, realistic reflections, and ray-traced shadows. Camera slightly below the orb, looking up through the cavernous city; shallow depth of field keeps the orb in sharp focus while background arches fade. Color palette: teal, cyan, indigo with warm gold accents, cinematic lighting, high-resolution 3D render (8K).