Ancestral Guidance( Races of Eberron, p. 105)
The spirit of your patron ancestor guides your hands and thoughts in times of trouble.
Elf, region of origin Valenar,
Any time you use an action point to modify a d20 roll, you can also choose to reroll a single action die. You must accept the result of the second roll, even if it is worse than the initial roll.
This benefit represents the favor of your ancestral spirit. If the DM determines that you have dishonored or angered your patron spirit, you lose the benefit of this feat until you have atoned for your actions.