Light Melee Master

You've learned to find the faults in the enemies styles, tactics, and armor. While using light melee weapons you strike these faults with uncanny speed and  precision control. You gain the following benefits:

• Before you make a melee attack with a light melee weapon, which you are proficient in, you may choose to take a -5 penalty to the attack roll. If the attack hits, add +10 to the attacks damage.