I think the main reason that sword is in the game in the first place is that you get it in BGI, and as it came in very handy then;it would be logical that you had it with you when you were captured by Irenicus (BG1, for those of you who don't know, is just swimming with doppelgangers, werewolves, wolfweres, and druids.) Another item like that is the Amulet of Metaspell Influence, though its usefulness is quickly replaced by stronger items later in the game.
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