One-Handed Weapon Master

You've refined the art of weapon use, and can perform swift, powerful maneuvers with a one-handed weapon.  You gain the following benefits:

• On your turn, when you take the attack action and miss with at least one attack, you can make one additional melee weapon attack as part of that same attack action, provided it is a one-handed melee weapon and you are wielding no other melee weapons. 
• Before you make a melee attack with a one-handed melee weapon that you are proficient with, you can choose to take a penalty equal to your proficiency bonus to the attack roll. If the attack hits, you add 2 times your proficiency bonus to the attack's damage.