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yeah, the way of the staff. heh heh heh. there is a staff expertece, IIRCX.

<slap slap slap> Naughty Lews! <img src="/ubbthreads/images/graemlins/tongue.gif" alt="" />

There is no Staff Expertise. My partner was looking for it because Wizards are generally too weak to wield much else and still have any melee effectiveness. I think their high damage to requirements ratio is why they didn't see need for a Staff Expertise.
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you don't need an expertise for daggers since you have the survivor skill assassin's kiss.

As far as I'm concerned, that is Dagger Expertise. Backstabbing doesn't mean the same as what it does in D&D. In D&D, you literally have to stab them in the back for it to work, a far too difficult prospect for Divine Divinity.