"...A.) she's super-annoying..."
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I mean no offense. May I disagree? You can do so she stop talking to you. Also after a certain point she is not annoyng. Let me tell you that she had over 20% of all the killings in the game after I rolled it. Also she never died. Also she can turn undead - did you seen what happens to the undead when 26 lvl cleric is near turning them ? I think there is no need to explain how powerful is a cleric/mage at the higher levels. To develop Jaheira is harder than developing Aerie, but she is extremly dangerous at the highest levels - you know fighter/druid when she shapeshift to fire elemental and attack with greater whirlpool and have more priest lvl 7 slots than Aerie. I have developed them both to their 25+ levels. If you want I may send you my savegame at the throne before the last fight so you may see and try Aerie, Jaheira, Minsc, Keldorn, Imoen and lvl 28 sorcerer.
"...B.) I'm trying to go through the romance with Jaheira..."
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What is the problem - just do it. I'm trying the same right now, but I've Tashia with me and I'm wondering what will happen with the two romances, but this is another topic.
"Can Imoen replace her?"
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Imoen can not replace Aerie. Imoen is a mage. she'll got her first time stop earlier than aerie, but will never have the ability to do 10d10 blunt damage with a spell. Its a pity that you can not level up her as a thief.
"Does Nalia have anything else to add after I get the stronghold?"
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As far as I know - no.
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