What I did was get the sword of chaos +2 from Irenicus dungeon, equip that with your guy and start pounding on the stone golems while your casters cast spells, they should drop dead relatively quickly. I had:
Berserker Human use the sword
Anomen use a +1 mace
Cernd shapeshift (got him real quick
, and he doesn't seem that bad)
Viconia cast bless and other spells
Jan Magic missle
Minsce dunno
The other guy above (spell caster) sort of hurt, but it wasn't overly hard.