Well, actually, thieves are so powerful in ToB... coz of their "Use Any Item" ability... oh well...
Welcome to the board!!!
Oh! Tips? Be sure that you love the kit or thief class, and make sure you have a:
High Con, Dex
Lock-picks expert and trap detection... later are the rest
knows how to backstab
Those are the key elements of a thief... they are the priority... worry about the rest later!
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Chaotic Cavalier of ALSB, protector of the Innocent, slayer of the mad...