Sorcerer Utility 16Damage Gambit
With high hopes, you trust in chance to empower your attack.
Free Action Personal
Trigger: You make a damage roll.
Effect: Reroll the damage roll, and use the new result. If the new result is higher than the triggering damage roll’s result, you deal extra damage equal to your Charisma modifier. If the new result is lower, you take psychic damage equal to your Charisma modifier.
Published in Dragon Magazine 385, page(s) 48.