Fun instance - mobs are a bit too far apart for my taste. Only boss that caused me trouble was the first boss until I found the tactic. I will upload a video sometime tomorrow.

Anyway, the tactic is to bunch up at the boss with your whole party. Ignore chains of ice and the curse and just heal when needed. DPS boss and divine shield if he tombs the tank (consecrate needs to be up to catch the adds). No need to kill the adds (they died from my chain ligtnings without me targetting them.