One more note, part 4 of the quest will require a full group of 55+'ish, including a Mezzer. You cannot raid the encounter, but you can have out-of-group DPS, mezzer, and healer support. The Djinn have elemental-based attacks, cold included.
Our Mezzer was out of the group, and when we initiated the encounter, he quickly mezzed two of the Djinn, making the whole fight last less than 4 minutes. A nice outcome, seeing as how our previous attempt resulted in a wipe in less than 1 minute.