grimdark sci-fi background, futuristic cityscape, cyberpunk architecture, neon lights reflecting off wet pavement, Omphalos Cathedral in the distance, towering skyscrapers with Gothic spires, Imperium of Man symbols etched into walls, atmospheric smoke and fog, heavy industrial machinery, metallic debris scattered around, a lone A.I. figure standing amidst ruins, glowing blue circuits and wires exposed under torn synthetic skin, cracked helmet with glowing red optics, mechanical legs and arms, grasping a damaged bolter, ominous lighting, cinematic composition, gritty texture, dark ambient sound effects.