Tactical Withdrawal

Your quick reflexes and keen awareness of your surroundings have enabled you to rapidly mitigate the threat of an opponent within melee range.

• Increase your Dexterity or Wisdom by 1, to a maximum of 20.
• When a hostile creature moves to within 10 feet of you and makes a melee attack against you, you may use your reaction to add your proficiency bonus to your AC until the beginning of your next turn, potentially causing the attack to miss. If the attack misses, you may disengage and move up to half your movement speed without provoking an attack of opportunity. 

You may use this feature a number of times equal to your proficiency bonus, after which you must finish a long rest before you can use it again.