Ahh, yes Moirane I know the place, and I have released them all. There was a dwarf there that you could talk to and...etc, you got an item eventually, but no girdle. I haven't heard that you get a girdle there. Kerlyssa, you must be talking about the girdle of frost giant strength that you get in underdark after...SPOILER ALERT!!!!
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...after you have sacrified a summoned creature on the altar and killed the bad knights.
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Hmmmmmm...Yes, that must be it