Green reticulation covers this veil, and emerald serpent heads weight the corners.

Wearing a serpent veil gives you immunity to the green effect of any prismatic spell. This is a continuous effect and requires no activation.
When you activate a serpent veil, it poisons a single creature affected by an arcane melee touch spell you cast previously in this round. The initial and secondary damage of the poison is 5d10 points of damage (Fort DC 20 negates). This ability functions three times per day.

Prerequisites: Craft Wondrous Item, circle of death, possession of a piece of the set.
Cost to Create: 8,000 gp, 640 XP, 16 days.