Witch's Peak Campaign
Dergon wants to gain resistance to god-light and is having difficulty getting it using his cult of C'thern because his god is dead.
Theme: Bewitching power leads to madness.
Dergon is the cult leader, or the power behind the leader, of a group of Drow. In times long past their god traded their cult to another god in exchange for a favor in a coming battle. When the rest of the drow people were freed upon the death of their god Dergon's people were still enslaved.