The torrent once swallowed everything.
After the tide recedes, on top of the remains of the old civilization.
Human beings established new kingdoms and city-states.
The empire had stood for thousands of years, but it had fallen into decay.
Within the city-state.
A lonely soul walks among the crowd;
Evil spirits huddle in night alleys deep in the mountains;
Skills, laws, Taoism, and martial arts all fight against each other day and night.
Until the tide came again, and countless strange beasts awakened here.
The long dark night finally has its own rules.
Concept: A person may not be the protagonist, but the spirit can