A terrifying female warlock bound to an ancient cosmic serpent sleeping beneath the frozen northern oceans, standing alone upon black coastal cliffs during a violent storm. She has long dark wet hair, pale frostbitten skin, and glowing emerald eyes filled with unnatural knowledge. She wears layered black ceremonial robes, sea-weathered furs, silver serpent jewelry, and ancient rune charms associated with forbidden tides and prophecy. Green eldritch magic coils around her hands while enormous spectral serpent shapes emerge faintly through storm clouds and crashing sea mist. The ocean behind her feels impossibly deep and ancient, as though something vast watches from beneath the waves. Dark nordic cosmic fantasy illustration, cinematic storm lighting, eldritch sea atmosphere, realistic textures, painterly realism, mythological horror aesthetic