Generate a 4K, ultra-realistic image of Nova Aeterna under siege

Generate a 4K, ultra-realistic image of Nova Aeterna under siege. The cityscape features futuristic spires and energy shields, with alien ships attacking from above. Explosions and energy beams light up the sky, with the city's defenses actively engaging. On the ground, humans and aliens fight amidst futuristic vehicles and weapons. Emphasize the detailed architecture of the city, realistic effects of explosions and energy, and the intense, dynamic battle scene