Not sure if this is a bug or not but here is how it is done...
Recall
You cast the Assassin skill Recall on one of your hero/henchies, flag them over to the left side (not sure if it works on the right side also), when they get there, end Recall, and poof you are exactly where they are and the mobs are in there respective corners. Also, and this is important... DO NOT MOVE AN INCH, once you move the mobs get aggro'ed. Only the hero/henches move, after you Recall to them then you can move, just attack one group at a time.
Here is the build I used:
D/A
Lightbringers Gaze
Heart of Holy Flame
Balthazar's Rage
Meditation
Zealous Renewal
Avatar of Dwayna
Shadow Refuge
Recall
I did the mission by myself in under 5 mins. I'm sure other builds can work too, you just have to use Recall not to aggro the mobs.
Sorry if this is posted somewhere else, the only thread I found was one that was locked.
Grand Court of Sebelkeh - How not to Aggro
lipp74
ramma77
or you could just kill everything that moves in 5 minutes without using any exploit of any kind
BUUUU
Yes.. you can do two persons (with heros and henchies..of course) ...one don't move from the circle then another with henchies go to left side and start killing..Fast and Sure master. Moving up middle isn't easy to most pro. I found out by paying one guy 5k to run that mission, after tired of doing again and again..
Lucifer PVP
this was already posted when nightfall came out