The ruin that birthed a society; the Life and Times of a city in the throes of death.
11 great statues of lost gods being chipped away by the condemned.
All spell casters gain their abilities through a form of demon possession. So in order to gain magical abilites, PCs must track down and trap demons. Of course there are some pretty powerful demons, if the demon is stronger than the PC, the PC could find themselves subjugated to the Demon's will.