Counter Attacker

You take advantage of your enemy's advances and openings:

• Increase your Strength or Dexterity score by, to a maximum of 20.
• When an enemy within your reach makes an attack roll against you, you can use your reaction to make a single melee weapon attack against that creature.
• When a creature misses you with a melee attack, the next attack roll you make before the end of your turn against that creature is made at advantage and can crit on a roll of 19 or 20. This effect can be applied to the attack granted to you by this feat.