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If you speak to the duergar selling stuff in the southerne part of the Underdark, buy a Freedom Scroll. Head north a bit, save, and use the scroll. A mage will appear if you're in the right area. If not re-load. He starts the quest involving the portals.
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The RudeDawg
Known in these Forgotten Realms as Perin LightEyes
and my girlfriends, Pamila and Phil