Warlock Utility 6Dark One’s Own Luck

Refusing the result that fate has decreed for you, you invoke stars of chaos and uncertainty and try to rewrite what has been written.

Daily        Arcane
Free Action      Personal

Trigger: You make a roll you dislike

Effect: Reroll the attack roll, skill check, ability check, or saving throw, using the higher of the two results.

Published in Player's Handbook, page(s) 134, Class Compendium.