Hydra in the Tower: 3D Render

A photorealistic 3D render of a colossal hydra inside a crumbling medieval tower. The hydra is a multi-headed serpent with 6-8 heads, each head snarling with fangs and wet, iridescent scales in shades of emerald, teal, and deep blue. Glowing amber eyes on each head. The creature coils around a cracked stone pedestal at the center of a circular chamber; tentacles of shadow hug the walls. The tower interior features worn granite blocks, a winding spiral staircase, arched windows, and wrought-iron torch sconces casting flickering warm light. Dust motes hover in the air, and voluminous beams of moonlit and torch-lit light slice through narrow slits, creating dramatic shadows and brilliant highlights on wet scales and mossy stones. A subtle pool or shallow water around the pedestal reflects the heads. The scene is a high-detail cinematic shot with realistic textures, depth of field, and volumetric lighting, from a low angle to emphasize size and menace.