A slight tweak for Tieflings

Tieflings are a deceivingly powerful race, with one of the best racial bonuses (bloodhunt) and the very nice Fire Resistance. However, the usefulness of their racial encounter power (Infernal Wrath) depends too strongly on their Charisma score, which is otherwise irrelevant for many class builds. This means that Infernal Wrath becomes almost worthless, not only for relatively unusual characters like tiefling fighters or rogues, but also for builds as iconic as tiefling wizards or infernal warlocks. Since I think that the power works fine for characters with Charisma as a primary or secondary ability, I have come up with a small house rule: rather than Charisma, use one mental ability score (Int, Wis or Cha) chosen at first level. It would look as follows: