Prerequisite is to acquire the two weapon fighting style, dual weapon fighting and dual wielder feat.

The Wayward counter an unpredictable move set you develop after reaching the pinnacle on using your swords,
With training one can achieve greater heights.

 
This feat is a style that can be learned after acquiring the required feats,
Gives you a +6 on AC and as a reaction you can use the counter attack 

Wayward Counter-Attack.
As a reaction, you can block any attacks with your own untargeted attack roll, contesting DC is the attack roll being contested, this attack roll always have an advantage
On a successful counter, the attack is negated or redirected back to the attacker, also on a success once per turn you gain AC equal to your proficiency until the start of your turn.
On a successful counter you can only use this feature twice your proficiency bonus per day, the charges resets on a long rest.   
When you successfully countered an attack you can move away from it or chase it without provoking an attack of opportunity using half of your movement.