Umber hulks are not immune to the cloud. They have fewer than 6 hit dice, which means instant death for them (They might get a save, but I've never seen one make it). So, for that matter, does death spell, which is nicer because it doesn't harm party members.
SPOILER
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A favorite trick of mine for some cheesy extra XP is to kill the umber hulks, then go place the dog stew anyway. You still get the XP for doing the quest on top of the XP for killing the beasties

Far as I know, this works even with Baldurdash installed.
[ 07-14-2003, 01:03 PM: Message edited by: cerandil ]