You got the stats from BG2, I see... those are wrong, I'm fairly sure... after all, in the books, his dagger does a very powerful life drain type affect, not level drain... Also, I believe there was a part of one of the books where it cut through some drow's mithril chain mail "like through paper" or something like that, can't remember the exact thing, but very easily... while wielded by Regis... so I'd guess that it's really more than a +4... *shrug*
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