The "Poisoned Man / Xzar" quest is not a part of any of Jaheira's quests--it simply must be completed before Jaheira's Harper quest can start. And Renfeld can be found without even leaving Athkatla (I just did so)--just wander around different districts. I just found him on a Graveyard-to-Gates trip.
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Volothamp's Comeuppance
Everything you ever needed to know about the entire Baldur's Gate series......except spoilers.
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