Dark fantasy, Dagoth Ur, ancient deity, tentacle creature, Cthulhu mythos, mysterious, eerie atmosphere, dark misty environment, old ruins, crumbling stone walls, vines and moss covering, glowing eerie blue eyes, massive twisted horns, scaly skin, long flowing black hair, tattered dark robes, intricate carvings, mystical runes, dim torch lighting, dramatic shadows, cinematic composition, 3/4 view, atmospheric perspective.