This MM is fairly easy once you get the formula down.
Me and a friend usually box this, I play as an enchanter and a warrior, my friend plays as two warriors.
The key to this MM is that the warriors must run in and tank for the named froglok until the chanter manages to mez all of the mobs except one which the chanter calls out and the warriors proceed to beat on. Warriors should make liberal use of their stuns and crippling strike techniques to interrupt casters and healers(since they will be dying A LOT and will have plenty of endurance), if you have more than 4 characters, you may want to invest in a shaman, but it's not necessary as we can finish in an hour with 4 people(More warriors might be a wiser choice.)
The chanter should keep mobs mezzed and call out the next mob once the current target is dead. Make use of the "Theft of Thought" ability, it steals a good 15% of mana and does not wake up mez. We usually take on healers, casters, melee DPS, and then the tanks.
The camps will be attacked in this order:
Assassin
Arch Magus
Cavalier
Executioner
Savant
Ghoul Lord
If any of the named die the mission is failed, it's important to stress that the warriors need to tank for the named once the invaders arrive, the chanter should also mez the mobs on the named first.
Upon clearing the Ghoul Lord room of the invaders, the chest will spawn in the room. The belt is the common drop, and the rare drop are plate gauntlets which are identical in stats to the other plate mm pieces except for 39 AC(9 to stats, 8 disease magic poison, 95 hp 90 mana.
AA XP is a bit lower than a point.