AAF: Empower Ability

Empower Ability	You empower your abilities, increasing their effectiveness based on what they can do normally. When you roll dice for damage or healing from an ability (including weapon damage), you can reroll a number of those dice up to your ability usage modifier (minimum of 1) during the Cast, Use, or Sustain of such. You must use the new rolls.
Prerequisites Character level 1	Cost: 1 per ability rank (min 1) Restrictions: Once per spell. The cost cannot be reduced by any means.