The material below is Open Game Content from a 3PP Source
Sword of Life Stealing
Aura strong necromancy; CL 17th
Slot none; Price 25,715 gp; Weight 4 lbs.
This black iron +2 longsword bestows a negative level when it deals a critical hit. The sword wielder gains 1d6 temporary hit points each time a negative level is bestowed on another. These temporary hit points last for 24 hours. One day after being struck, subjects must make a DC 16 Fortitude save for each negative level gained or they become permanent.
Requirements Craft Magic Arms and Armor, enervation; Cost 13,015 gp