A waning crescent-shaped gemstone formed from coagulated poisoned blood. It has no use in its current state, but if used to enchant a slashing weapon, it adds a poison effect. 

Effect: Attack rolls made with this weapon receive a +1 bonus to hit. A creature hit by this weapon must make a DC 12 constitution saving throw or be poisoned for 1 minute. The creature can repeat this saving throw at the end of each subsequent turn, ending it's effect on a success. While poisoned, the creature takes 2d4 poison damage at the end of each of its turns. 

Notes: bard, sorcerer, warlock, wizard