You intone a dread curse upon your foe, linking its fate to the safety of your ally. If your friend is hurt, your foe will be hurt as well.

Encounter   ✦     Arcane, Implement, Psychic
Standard Action      Ranged 10

Target: One creature

Attack: Charisma vs. Reflex

Hit: 3d10 + Charisma modifier psychic damage. Choose an ally within 10 squares of you. Until the end of your next turn, the target takes 10 psychic damage whenever that ally takes damage.

  Virtue of Cunning: Whenever the ally takes damage, the target takes psychic damage equal to 10 + your Intelligence modifier.

Published in Player's Handbook 2, page(s) 77.