You lodge a painful psychic shard in your enemy's brain that resonates whenever you take damage.

Encounter   ✦     Arcane, Fear, Implement, Psychic
Standard Action      Ranged 5

Target: One creature

Attack: Charisma or Constitution vs. Will

Hit: 2d8 + Charisma modifier or Constitution modifier psychic damage. Until the end of your next turn, when you take damage, the target takes half that amount of psychic damage.

Update (8/15/2011)
Updated in Class Compendium.

Published in Player's Handbook, page(s) 140, Class Compendium.