You have learned to strike with devastating effect to take advantage of openings in your opponent's defenses while bolstering your own. When wielding a finesse weapon that you are proficient with and not using a shield or wielding a second weapon in your off hand, you gain the following benefits:

• Your AC improves by 1.
• Before making an attack roll with a finesse weapon you can choose to take a -5 penalty to the attack roll. If the attack hits, you add +10 to the attack's damage.