I was thinking of an idea for an RP.

Humans, on the verge of extinction, make a pact with vampires; in exchange for their blood, the vampires would help provide protection against the monster population outside the walls. Through time, humans and vampires developed alongside each other, eventually discovering magic. While this provided a good, easy life for both parties, it occasionally becomes much more difficult.

Once a year, for two weeks at a time, an eclipse blocks out the sun. While normally confined by the light of day, monsters are completely free during the eclipse.

Anyone interested?