Ebb and Flow

You get one Fortune and one Misfortune dice.

Once per day, after knowing the result, but before knowing if it's successful, you may expend one Fortune dice in order to reroll one of your own Attack Rolls, Ability Checks or Saving Throws. You make pick either roll as your decided roll.

Once per day, after knowing the result, you may expend one Misfortune dice in order to have a hostile target you are aware of within 300 ft. reroll an Attack Roll or Saving Throw. You choose which dice they take. A creature's roll can only be affected once per roll.