i have a cool tactic against those demons (balor, tanar'ri etc)
this assumes that you have at least one guy in your pary with +3 weapon (being in the underdark and all..)
send someone with decent hitpoints forward (not the one with the best weapon) and let him be paralyzed by the balor.. (hmm.. i forgot to mention that you must have an otiluke's resilient sphere memorized.. thats not a waste since 4th level spells are mostly not great anyway) and once this guy is stunned.. cast otiluke's upon him.
the balor is very stupid and keeps attacking the stunned guy only but cant damage him because of the otiluke thing. meanwhile you can happily thrash it to death with others.
(the one problem with this is that.. if your party members have great saving throws they will often save against your own otiluke - makes me think they shouldn't allow saves against any spells cast by your own party members)
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