Colossal Moving Black Wall Approaches Desert Megacity

the prompt

Gigantic desert megacity at sunset.
Orange dust storms moving across endless highways.
People continue daily life normally.
Far on the horizon: a colossal black wall stretching infinitely across the landscape. At first it looks like weather.
Then people realize: the wall is moving. Slowly. Directly toward the city.
A man driving through crowded streets notices panic spreading gradually.
Emergency broadcasts begin. Military vehicles race through intersections. 
The wall grows larger every minute: taller than skyscrapers, perfectly smooth, completely silent,  swallowing sunlight behind it.
As it approaches: shadows stretch unnaturally, temperature drops, electronics malfunction, birds flee overhead.
The man abandons his vehicle and runs through chaotic evacuation crowds.
Behind the skyline: the giant moving wall dominates the horizon now. Dust storms spiral upward into it.
At climax: the enormous black wall reaches the outer districts of the city. The entire skyline disappears into darkness behind it.
The man turns around as the wall towers directly over downtown.
Then suddenly: the wall stops moving. Silence.
After several seconds, the structure slowly dissolves into fog and disappears.
Ultra cinematic sci-fi mystery thriller, giant scale visuals, environmental tension, realistic panic, desert cyberpunk atmosphere, cinematic lighting, grounded realism.