[Technology vs. magic, slow burn]
For reasons unknown, humanity's glorious civilization vanished into the annals of history.
Elves toil on assembly lines in steam-powered factories, laboriously tightening screws for their king.
The grasslands and forests that once made up ecological parks have become the territory of one orc tribe after another.
The ruined floating cities have become the new homes of dragons.
To them, humans are terrifying and powerful ancient beings, more frightening than demons and stronger than gods.
Elven archaeologists search underground for the ruins of humanity's past, waiting for the revival of that great age.
The book was obviously written slowly, but the huge world view ended before it was fully developed.