I've completed IWD2 twice, but neither time did I kill the fake Nathaniel, despite knowing that he was evil. I figured that if he was goign to be running a store inside Dragon's Eye and allow me to sell off my stuff, why bother killing him?
The fake Nathaniel was worth too much as a convenient merchant to kill while I was in Dragon's Eye and I didn't think that he'd be worth enough XP to backtrack into Dragon's Eye to kill later on.
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