You instinctively know when you hit an opponent’s weak spot and can muster an extra bit of force to devastating effect, causing your foe to suffer momentary fatigue.

The instant you sense an opponent has moved within your guard you immediately attack in response.

You leap atop your enemy just as it attacks.

Mastery is making sure even a mistake becomes an opportunity. You follow through on a miss to attack a different enemy.

When you miss with a melee weapon attack against a creature, you can use your reaction to take your momentum and target a different creature within your reach with a melee attack using the same weapon. 

You respond to an attacker’s weapon with a peerless defensive step that displays your prowess as a warrior.

When a creature makes a weapon attack against you, you can use your reaction to gain a bonus to AC equal to your proficiency bonus, possibly turning a hit into a miss.
 

With a bit of effort as an opponent strikes at you, you can knock the blow away and divert the attack.

Your victory pose spurs your allies.

Choose a weapon when you learn this combat maneuver. When you score a critical hit with this weapon, you can use your reaction to pose dramatically as you finish the strike. 

You have mastered a strike that is unmistakably your own.