Versatile Weapon Master

You have become adept at getting the most damage out of a versatile weapon as possible. You gain the following benefits: 

• When calculating damage dealt by a versatile weapon you are proficient with, you can use the two handed die size even if you are only using one hand.
• Before you make a melee attack with a versatile 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.