I found a hi ground position, separated my party into 2 spots, and started taking out the duergar. It was rough at times. Cloud of daggers kept them from coming up a ladder. Killed one guy...animated him into an archer. Grease on other avenues of approach. Corners to keep the archers from shooting as much as possible. Level 5 with Lazael, Shadowheart, Astarion,and myself as a Bard.
