Defensive Duelist

Prerequisite: Dexterity 13 or higher

When you are wielding a finesse weapon with which you are proficient and another creature hits you with an melee attack, you can use your reaction to add your proficiency bonus to your AC for that attack, potentially causing the attack to miss you.

• If you cause a melee attack to miss you in this way, you gain a bonus to the next damage roll you make with your finesse weapon against the attacker. This damage bonus equals your proficiency bonus, and lasts until the end of your next turn.
• If you cause a ranged attack to miss you in this way, you gain a bonus to your AC against ranged attacks from the attacker until the beginning of your next turn. This bonus equals half of your proficiency bonus.