Cinematic 8k wallpaper, colossal Cthulhu towering over a lighthouse on a moss-covered rock, raging stormy sea, precise focus, invokes megalophobia, ultradetailed 4k digital painting with subtle organic luminescence, photorealistic and cinematic quality, dark and atmospheric mood, intricate lumen reflections, immersive atmospheric lighting, delicate subsurface scattering, hyperrealism with mesmerizing detail, ultra-high-definition 64k shot, captured with DSLR clarity, vivid sharp focus, rendered with Unreal Engine 5 and octane render in 8k.