Well, personally I wouldnt touch Jaheira with a stick. She is sooo irritating. And what is the deal with that german accent. Or is it my version that decided to have fun with me.
Regarding her usefulness as npc. Im not going to deny she has some good points, but I think she is highly overrated. Viconia is far better than her (Jaheira choice of weapons is ludicrous) in almost every aspect. Spellcasting, combat, etc.
PLUS,
(Minor Spoiler)
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Vic doesnt care if you sleep with the Drow Priestess in the Underdark.
