If you have a paladin, just give himthe holy avenger, ring of gaxx and kalguns magic resistance and you have 70% magic resistance, then just make sure his saves are pretty low and it will be simple.
My main char is a Cavalier, i did this and i cleared out the intire ilithid dungeon in the underdark on my own without a single reload (i think i only got hit 3 times)
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Haladar
Mithril Cavalier of ALSB
Guardian Knight at the Holy Temple of Aerie
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