Perfect Deflection

You gain the following benefits: 

Ability Score Increase. Increase your Strength or Dexterity score by 1, to a maximum of 20.

Deflection Technique: When a creature declares an Attack with a Weapon Attack (melee or range), you can use your reaction to forgo your Armor Class against that Attack and instead attempt to deflect the blow. Make a Deflection Roll, which is a d20 roll + your proficiency bonus + either your Strength or Dexterity modifier (your choice when you gain this feat).

• Successful Deflection: If your Deflection Roll is higher than the attacker's Attack roll or is a Critical Hit, the Attack is deflected. You take no damage from it, and any other effects of the hit are negated. This works even against Critical Hit(must be a Critical Hit as well). Each time you successfully deflect an Attack from a specific creature in this way, that creature gains one Posture Break Counter.
• Failed Deflection: If your Deflection Roll is equal to or lower than the attacker's Attack roll, the Attack automatically hits you (even if the original Attack roll was lower than your normal Armor Class).

Posture Break: When a creature accumulates 3 Posture Break Counters from successful deflections (from you or others), its posture is broken. The creature is immediately Paralyzed until the end of your next turn. Once a creature is Paralyzed by this feature, its Posture Break Counters reset to zero. A creature's Posture Break Counters also reset to zero if 1 minute has passed since it last gained a Posture Counter from you.

Notes: You must have a melee weapon on hand or a shield.