You push your mind and body to their limits, gaining extra speed to react, but the strain on your mind leaves you suffering psychic backlash after pushing your limits. You gain the following: 

• You gain an additional reaction each round, but can still only take one reaction per turn. However, after using this reaction in the same round, you take psychic damage equal to your Dexterity modifier. This damage can not be reduced or prevented in any way.