Az'Hassin Daggers

These daggers were made for sneaking up on opponents, but it became apparent that they also had another very special ability. Indeed, if you are attacked head-on and you manage to counter the attack with these daggers, your body will – on its own – move to counterattack and kill your opponent for sure. If your enemies had the intelligence to attack all of you at the same time, you wouldn't have a chance, but since they stubbornly line up and attack one at a time, you'll massacre them.