"Blackjack" weapon/ Backstabbing focused weapon
New weapons for the dodgy stealthy kind of guys.
These are actually 1.5 suggestions:
1) A blackjack kind of weapon, like in THIEFs games. This blunt object has a possibility of stunning/putting to sleep opponents who are caught in a backstab with it.
1.5) Simply adding another suffix for weapons that do increased damage on backstabs only.