Willow, yeah, i loved serpent temple - except the last part with those elevators.
I found it really easy with the following technique:
1) Have spirit eye always in use on the priest, that way you can click
the map to see where things are. (only disadvantage is it shows rats/roachs)
2) I have a gourka as lead of my group so he senses mobs around, then I
use the priest as above
3) My two wizards have either lightning/elemental blast/incinerate always ready.
That way, as soon as you see them they are toast.
(also when soloing with a caster, just have any of those spells ready)