THAC0 Toughie

You possess the grit and determination of heroes past. When a creature within 30 feet hits you with an attack, you can make the attack miss. You can make an attack miss you a number of times equal to your proficiency bonus, and you regain all uses of this ability after completing a long rest.

Prerequisite:

During character creation, you must roll 3d6 to generate ability scores, and then assign the results to Strength, Constitution, Dexterity, Intelligence, Wisdom and Charisma, in that order.