This quest is only hard if you take the wrong route. When you start the quest it seems that you would go directly left, and going that way is the hard part. Instead of going left, go straight and you will find a somewhat narrow passage, go through there, go up the curved path, and follow the quest arrow to the zone. This quest is easier if you run it, and harder if you fight the monsters. To run it, just order a single hero to go aggro a big group of monsters while you just run past them.