It must be a bladed weapon, i.e. you cannot backstab with a club (doh...logical really
). So you can use long/short swords, katanas, scimitars, daggers and washiwhatevers
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Melusine, Archbabe of the Order of the Holy Flame and the Laughing Hyenas, &
Official Entertainer Elf of the BG2 Bar
Your voice is ambrosia