This all depends on class, gear, scrolls/wands, etc. Ulitharids might prove tough for, say, a sorcerer, but a fighter with low saves vs. spells or even Lilarcor could give 'em hell. A high-level cleric could chunk all those vampires with Turn Undead.
And, for those of you who have played ToB all the way to the end, there are ways to exist without rest.
Want something impossible to beat?
(SPOILERS)
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(don't read unless you've finished the game)
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(or you will get spoiled)
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Do the Test of Fear going clockwise through the room with a monk. [img]smile.gif[/img]