Versatile Weapon master

You learned how to use Versatile wepaons to their most masterful form.

You gain the following benefits when wielding a versatile weapon:

• Precision Strike: If you score a critical hit you can do an Additional attack as a bonus action and the weapon damage die becomes the damage die as if you where wielding it with two hands even if your wielding it with one hand
  
• Defensive Stance: As a reaction on your turn, you can assume a parrying stance, provided you have a versatile weapon in hand. Doing so grants a +1 to AC until the start of your next turn. This bonus is increased to +2 if you're two-handing a versatile weapon.
• Brutal Strike: Before you make a melee attack with a versatile weapon that you are proficient with, you can choose to take a -3 penalty to the attack roll. If the attack hits, you add +5 to the attack's damage.

You cant use this feat when your duel wielding two none light Versatile weapons such as two longswords