Well I never really used a Bard, but i love thieves. right now i am using one "ASSASIN" kit and dualling it to a fighter when it reach 5x backstab.
#1 Wizard killer. Poison dagger and 5x backstab.

die wizard.
anywayz, thieves are really kewl but i dont' suggest u begin with them the first time around.
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Mess with the best Die like the Rest!!