Defensive Duelist

Prerequisite: Dexterity 13 or higher
Your expertise in duel grants you the following:

• Increase your Dexterity score by 1.
• When you are wielding a finesse weapon with which you are proficient and another creature hits you with a melee attack, you can use your reaction to add your proficiency bonus to your AC for that attack (After hearing the final attack result), potentially causing the attack to miss you.