Prompt code:
A vast, decaying metropolis built on the ruins of a once-living planet. The city's structures are overgrown with alien flora and inhabited by swarms of biomechanical creatures. A repository of ancient knowledge and technology. The Necropoleis is also a place of pilgrimage for certain alien cultures. A diverse ecosystem of biomechanical creatures, ranging from tiny, insect-like drones to massive, lumbering behemoths.
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