SRD:Assassin's Dagger

Assassin’s Dagger: This wicked-looking, curved +2 dagger provides a +1 bonus to the DC of a Fortitude save forced by the death attack of an assassin.

Moderate necromancy; CL 9th; Craft Magical Arms and Armor, slay living; Price 18,302 gp; Cost 9,302 gp + 720 XP.