pawsplay said:
The wizard casts energy resistance on the barbarian, while the cleric lays on spell immunity to several of the balor's abilities. Once the barbarian has the thing's attention, the fighter and rogue attack. You might want to polymorph the rogue into a hydra... a full attack while flanking would be pretty good.
The Balor's
Greater Dispel Magic power makes the energy resistence and spell immunities probably pretty short-lived (since their effects are pretty obvious), and therefore probably not a good use of resources. Better to provide instantaneous help, such as healing, and defensive magic, such as
Protection From Evil to ward against the
Dominate Monster power (and keep hoping that the Balor just assumes your save is very good so that it doesn't waste a
Greater Dispel Magic).
Enlarge (both for the extra damage and reach),
Haste (for obvious reasons) and
Wraith Strike* (since it halves the Balor's AC against attacks by that person) are all invaluable spells against the beastie. Unless your cleric has the Spell Penetration feat, spells like
Holy Word are only going to be effective about 35% of the time.
Polymorphing the rogue into something like an advanced Pyro-hydra is probably a good idea. The fire immunity, multiple attacks and reach are all good counters to the Balor's similar advantages.
And of course that
Greater Teleport at will ability is a killer. It's very hard to keep such a critter in one place long enough to off 'em. It's not a bad idea to try a
Dimensional Lock or something like it, even if it doesn't have a great chance of succeeding.
* Caveat: I can't recall off the top of my head if SR applies to
Wraith Strike. Ignore it if it does.