Dark Sun - Destiny and sacrifice
A small, normal looking bone knife
This knife has two prongs hidden in the hilt. A release Catch on the hilt sets off the prongs. The knife is crafted so the prongs can be tipped with poison and the wielder can choose when to poison his attacker. The prongs can also be used in a surprise attack at very close range, as long as the target area isnt protected by more than normal clothes.
Pox found his widow’s knife from the dead body of a mul Tanixu agent.