Practiced Duelist

You have mastered the art of the duel, and you are deftly acquainted with exploiting specific advantages in one-on-one engagements, and looking good while doing it. You gain the following benefits:

• As a bonus action, you may mark a creature as your opponent. After hitting this creature at least once, you gain a 1d4 to your attack and damage rolls made against this creature. After hitting this creature three or more times, you instead gain a 1d6 to your attack rolls and a 1d8 to damage rolls made against this creature. Upon hitting another creature, your mark on this creature ends.

You may use this feature a number of times per long rest equal to your Proficiency Bonus.

• When a creature's melee attack misses your AC by 5 or more, you may use your reaction to make an opportunity attack on that creature. You may add your Charisma modifier to the attack roll. You cannot gain this benefit if the creature has an ally within 5 feet.