[Black Leviathan]

Think 7 deadly sins.

There's drug den in the dungeon that's making workers slothful. The young noble is being seduced by monsterous temptations. Monsters with mind control power exit the dungeon by night, filling villager's mind's with wrath and envy. Corruption is any measure that isn't taken from a purse or put into a grave, it could be caused by an articulate psychic effect or an overall sense of dread or hopelessness.