Something else to note... if you get a Paladin as one of Moroes' adds, they will buff him and the others with Blessing of Might. This might even be a supercharged version of Blessing of Might, as it allows Moroes to pump out some major damage. Our group was dealing with that until we realized the buff was happening... it must be purged off of Moroes at least, and the other mobs if and when you fight them.
If you're short on shackles, don't forget the Paladin's ability to fear undead. That's 20 seconds of a mob running around feared, and the paladin can re-fear 30 seconds after casting. There's a slight chance the mob might fear out of the room, however... this would reset the event. I've never seen it happen, but you've been warned