The Ruins Near Aerntil
These ruins were once covered by an illusion, for many years. Once this illusion had been discovered it’s location was revealed and people began investigating it.
The ruins had a strange Mirror Trap within that made the victim face some personal fear or demons.
Once past the traps, there was a group of cultists in Pelor robes, but wielding holy symbols of Vecna. It seemed the cultists were interested in the Codex Infernum in the back of the room, and largely ignored the treasure on the floor.