The weaknesses of your foe are obvious, singing forth from your enemy's soul in tongues only you can hear.

Encounter   ✦     Arcane, Implement, Psychic
Standard Action      Ranged 20

Target: One creature

Attack: Charisma vs. Reflex

Hit: 4d8 + Charisma modifier psychic damage. If the target is vulnerable to any damage types, your attack instead deals damage of that type. If the target has more than one vulnerability, you choose which damage type to deal.

  Dark Pact: If the target takes damage of a type it is vulnerable to, it takes extra psychic damage equal to your Intelligence modifier.

Published in Forgotten Realms Player's Guide, page(s) 39.