Gem of Psychic Poison

Book of Vile Darkness 3.5
By Monte Cook

This gem, when in the possession of a creature, poisons that creature so that anyone casting a mind-affecting or divination spell at the creature is affected with a Psychic Poison that deals 1d6 points of Intelligence damage as both initial and secondary damage.

Caster Level: 7th; Prerequisites: Craft Wondrous Item, poison area; Market Price: 28,000 gp.