Defensive Flurry

You gain the following benefits

Ability Score Increase. Increase your Constitution score by 1, to a maximum of 20. 

"You shall not pass." As an attack action, while wielding a melee weapon, you become a maelstrom of motion. Until the start of your next turn, neither friend nor foe can enter a square you threaten unless they are two sizes larger than you and attacks against you are at disadvantage. This feat can be used a number of times equal to your proficiency bonus. You regain all expended uses after a short rest.