Blade Master

You are a master of blades, including the dagger, doublebladed scimitar, double-bladed sword*, shortsword, longsword, scimitar, rapier, and greatsword.

You gain the following benefits when wielding any of these weapons: 

• You score a critical hit using the weapon on a roll of 19 or 20 (or increase your critical range by 1 if you already score a critical hit on a roll other than 20.) 
• When you make an opportunity attack with the weapon, you have advantage on the attack roll. 
• A creature within your reach that misses you with a melee attack provokes an opportunity attack from you.