Warlock past life: Delver of the Forbidden is mostly useful by sneaky toons, but I found it immensely useful in Faithful Departed. This quest is such PITA that I had not run it in several years. Today my main (Arti 10) soloed it on elite, and lost only one Venerated. Every time I opened a door into a room with Venerated, I would throw DotF curse onto as many drow scorpions as I could. They would cease attacking Venerated, and fight each other instead. That gave me enough time to kill everyone in the room.