The material below is Open Game Content from a 3PP Source
Aura strong necromancy; CL 13th
Slot none; Price 40,320 gp; Weight 12 lbs.
This +1 greataxe is favored by undead and constructs, who do not suffer its drawback. A life-drinker bestows two negative levels on its target whenever it deals damage, just as if its target had been struck by an undead creature. One day after being struck, subjects must make a DC 16 Fortitude save for each negative level or the negative levels become permanent.
Each time a life-drinker deals damage to a foe, it also bestows one negative level on the wielder. Any negative levels gained by the wielder in this fashion lasts for 1 hour.
Requirements Craft Magic Arms and Armor, enervation; Cost 20,320 gp