Parry

"You parry an incoming blow." -Description

Tier 1	As a reaction, when another creature hits you with a melee attack, you can add your proficiency bonus to your AC. To do so, you must be able to sense the attacker.
Tier 2	You add a d4 to your AC and you can also parry ranged attacks that would hit you.
Tier 3	If the attack misses because of this maneuver, you may either gain temporary hit points equal to the difference of the hit and your AC, or make a Riposte maneuver for free.