Sidestepper

You have honed your body into a nimble combatant, making your enemy struggle to hit you as you dart out of harm's way, so in addition to increasing your Dexterity score by 1:

Backdash: When an enemy targets you with a melee attack, you can use a reaction to move 5ft without triggering Opportunity Attacks, and the attack roll attempted misses automatically (use before the roll is made).

Agile: At the end of each of your turns, roll a d4 Agile die and add the result (Agile AC) to your current AC, reducing your Agile AC by 1 each time an attack roll against you misses until your Agile AC has a value of 0.