IIRC, thieves can't use greatswords. I may be wrong, as I was on druids and large swords(I forgot scimitars), but it doesn't seem likely to me. 'course, I haven't played in a while.
Assuming he can, looks great. Since you want a nice backstabber, I'd go with Nick's build 2 for maximum back-stabbage and the ability to go berserk in the middle of an enemy fortification after stabbing, leaving room for the rest of your party to storm in and beatdown.
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