I had Stonehealer, Tahlkora, and Dunkora all set up as Smiting monks with the following build OwAT0GHD5xkwPQJVfXC1/jETAA, typically Dunkoro is runed as a healer, Tahlkora as a protector, and Stonehealer as a smiter so their att points where all over the place but I focused on the smite att and divine favor.

I used the following build OgMV8CrcZsl3ZxcY6ttyizjR1ITA

Completing the team were the following henchmen: (you will notice no Warriors/Tanks)

Mehnlo [healer]
Lina [prot]
Herta [earth]
Lo Sha [illusion]
I did not have any problems once I established the proper pulling procedure. Something like the following was repeated for each mob:

Place entire group (excluding myself) about 1.5x the radius of the agro bubble
Slowly approach the mob targeting the closet baddy and then fire a normal bow shot using no skills
Run like hell away from mob allowing them to focuse on you but keep distance
Keep pressing c as ypou lock onto the nearest baddy (it will change as they run) you will either find yourself attacking the wizards or brutts alone without any healers around.
Do this procedure a couple of times until all that is lest if the group is the healers. Then Kill Them too
Rise and Repeat.
The final Boss battle itself is done in very much the same way. Get him in a corner (he likes to run) and when he dies move the team away from the spirts and focus fire on the soul. After about 5 times of doing this you should have the soul dead.