Just completed this mission, and I'll give people some tips.
Bring Trappers. Having 1-2 trappers really makes everything a lot easier. For every mob set up traps and get someone to pull them towards it.
Camp the King. Set up traps on the stairs, and near the king, and make sure everyone stays near the king.
Just 2 Monks. Don't take more than 2 Monks. Bring a Necro with Well of Blood, and Blood Ritual, it really helps. Minions aren't too bad either.
Nuker. Continual Meteor Showers and Firestorm really do help.
King. Casting Mending/Watchful Spirit on the King will help.
This is the build we had.
Necro
Ranger
Monk
Monk
Warrior
Warrior
Warrior
Elemenalist
A

