no that was not me. I never avoid a challenge:-)
What party do you have ? (I couldn't keep them alive with only 2 casters cleric, wizard)
you need scrolls:
- mass death ward (recast it immediately if even only 1 of your men or karef/quoris has been dispelled)
- mass heal (will use it a lot)
- mass harm (if you have time and don't have to heal)
- dominate monster (dominating the first approaching balor is first priority)
- dominate undead (leveldraining vampires on your side is a good thing)
- dehydrate (should nothing be in domination-range)
- greater disintegrate (golems mainly but also other things, domination is more important though)
If something is in Domination range use a domination spell, only if not do something else like haste, foresight, whatever.
Mass heal every round unless you have to cast deathward or everyone is not much hurt in which case you can mass harm.
Cast web early but so that Karef is webbed as well (or be lucky that the spider wizard cast it on you), not only will that slowdown the approach of your foes, more importantly it will force Karef to stay where he is, otherwise he likes to wander off to his doom. Be aware that going out there meleeing=certain death.
Have your knights shoot slaying arrows. Here are the good ones: construct (odds are you will get rid of the golems immediately), humanoid (for the muls), animal (thrikreen). Dragon, Outsider arrows most likely won't work anyway so don't bother. Might have restoration/remove neg levels handy to heal up Karef when he got some beating and drained stats/levels. It is first priority to dominate both Balors, dominating the spider wizard & the vampires is 2nd priority.
Had you killed the Vrock in the tomb he wouldn't be here fyi.
Be equiped optimally. All casters should use shields (no weapons equiped), mithril light shield (no asf) for wizards, have max possible AC, Displacement cloaks.
EDIT: I do not have Mass Dominate, only Mass Hold Monster but all opponents there are with good will saves and I cannot get into melee with them in time to do Coup de Gra.
Then buy a scoll of it it Vanicia or Norbury, somewhere should be one, this is by far the best spell in game - without it your chances are drastically reduced.
edit: of course you don't have to keep them alive, that's just an additional selfimposed challenge, might as well not bother with them