yes, Areie is a good NPC, she can cast both mage and priest spells and can be very useful if you need to ressurect people. However, you already have two mages in Jan and Edwin and two Cleric's in Anomen and Viconia and you have yourself and Minsc as fighters with your choice of secondary. You are very well covered magically and that is all that Aeire does, so you are not missing out unless you wanted to romance her.
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