Aquatic demon with a humanoid form, possessing angular features and an iridescent blue skin tone; its furrowed brow and menacing sharp teeth displayed in a partially open mouth convey a sense of fierce intelligence. Set against a vibrant underwater backdrop, enhanced by the cinematic lighting of Unreal Engine 4, this 3D character exudes a presence both mystical and ominous, with slight bioluminescent glows along its sinewy form, adding depth to its enigmatic allure.