Finesse Weapon Master

You've learned to use the finesse capability of your weapon in making more precise and damaging attacks. You gain the following benefits:

• If they are made with a finesse weapon (thrown or in-hand), your weapon attacks score a critical hit on a roll of 19 or 20.
• Before you make a melee attack (thrown or in-hand) with a finesse weapon that you are proficient with, you can choose to take a -5 penalty to the attack roll. If the attack hits, you add +10 to the attack's damage due to the precision of your hit.