By skyforbes 
The Scene: The Crystal Cave and the Lumina-Beast
Landscape: A vast, subterranean crystal cave system. The cave is dimly lit, but the walls, floor, and massive hanging stalactites are made of shimmering, bioluminescent crystals that glow in shades of deep blue and vibrant violet. A slow-moving, glowing river of quicksilver flows through the center of the cavern, reflecting the light and casting an ethereal, moving shimmer across the scene. Small, glowing pools of water dot the landscape, and strange, translucent flora grows in patches where the light is strongest.
Creature: A massive, gentle beast called a "Lumina-Beast". This creature has a body like a large, slow-moving bear or ox, but its hide is not fur; it is covered in smooth, polished segments of the same blue and violet crystal found in the cave walls, with faint light pulsating from within. It has large, multi-faceted eyes that resemble amethysts and glow with a soft, internal light. Instead of a traditional mouth, it has a circular, filter-feeding maw lined with fine, shimmering, feather-like filaments used to consume the light-emitting plankton in the river. It moves deliberately, its heavy steps creating deep, resonating hums that echo through the cavern, and its very presence seems to amplify the glow of the surrounding crystals.
The Action/Focus: The Lumina-Beast is standing at the edge of the quicksilver river, its head dipped low as it gently filters the glowing water. The scene should emphasize the contrast between the creature's immense size and its delicate, almost serene action. Focus on the interplay of light and shadow, and the dramatic scale of the underground environment."