Stone Age 3D Spider in a Prehistoric Cave

Hyper-detailed, photorealistic 3D render of a large spider in a Stone Age cave. The spider has a rugged, weathered exoskeleton with earthy browns and ochres, a segmented abdomen, and long spindly legs covered in fine hairs. The cave walls are rough limestone with stalactites, primitive cave paintings, and scattered stone tools and bones. Warm torchlight casts dramatic orange shadows across the scene, contrasting with cool ambient light in the background. The ground is dirt with small rocks; the spider stands on a rock near the cave floor, eyes glinting, poised to move. Use physically-based rendering to show detailed chitin texture, micro-scratches, moisture on stone, and subtle subsurface scattering. Camera angle from ground level for an imposing perspective, with shallow depth of field keeping the spider in sharp focus while the background remains softly blurred. The overall mood is ancient, primal, and cinematic.