I found something kinda cool about the fight is if you pull and position yourself closest to the mobs they will all rush you, this was pretty essential to my group beating them since we had shadow priest/holy priest/warlock/ shaman(can they get any more squishy).

Basically what would happen is on open all the mobs would rush me, mortal strike would also fear half the time, I found it a really good way to open the fight.
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Paladin/70/Rivendare