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Cloudkill the Umber Hulks straight off, for sure. Chaotic Commands is standard procedure for psionic blast, but I think in the Underdark you also might be able to get some *salt water* to protect against psionics as well...
[If you're REALLY desperate (maybe short on good spells) and don't mind a little wimpiness, try putting an invis character or two in a doorway to block them out, and throw things at them.]
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