This weapon is composed of a black crystal that seems to absorb the light around it.

When you activate a stygian weapon, the next successful attack you make before the end of your turn bestows one negative level on the target in addition to dealing normal damage. This negative level lasts for 10 minutes, and thus can’t result in a permanent level decrease.
A stygian weapon functions three times per day.

Prerequisites: Craft Magic Arms and Armor, enervation.
Cost to Create: 1,000 gp (plus 300 gp for base item), 80 XP, 2 days.