Cinematic 8k wallpaper, massive Cthulhu 8k, prominently centered near an ancient weathered lighthouse perched atop a moss-covered cliff, ocean waves tumultuous and crashing, razor-sharp focus, evokes megalophobia, intricately detailed 4k digital painting, subtle bioluminescent glow, photorealistic and cinematic, film-quality rendering, dark and moody ambiance, intricate reflections on the turbulent sea, dramatic atmospheric lighting, subsurface scattering effects, hyperrealism with intense detail, ultra-realistic 64k UHD imagery, akin to DSLR capture, crystal-clear focus, enhanced with Unreal Engine 5 and Octane Render, superior 8k resolution.