Aquatic demon with a humanoid figure, angular features, and a deep azure skin tone, sporting a furrowed brow and menacing, sharp teeth. The mouth is slightly agape, revealing an eerie, otherworldly presence in its expression. Set against a mystic underwater background, the scene is captured in stunning 3D with Unreal Engine 4, utilizing cinematic lighting to enhance the creature's ominous aura and the ethereal beauty of its submerged world.