Cinematic 8k wallpaper, colossal Cthulhu emerging from turbulent seas, towering over a lonely lighthouse perched on a moss-laden rock, waves crashing in dramatic fury, ultra-sharp focus, invoking megalophobia, intricately detailed digital painting, soft organic luminescence, photorealistic with cinematic allure, evoking a dark, moody atmosphere, stunning lumen reflections and atmospheric lighting accentuate the scene, subtle subsurface scattering adds depth, hyperrealism in every texture, meticulously detailed photo quality 64k uhd, captured as though with a high-end DSLR, sharp focus through Unreal Engine 5, masterfully created with Octane Render, presenting an 8k visual masterpiece.