Longsword Mastery

You master fighting with the Longsword, gaining the following benefits:

• You gain a +1 bonus to AC while you are wielding a Longsword. You must not be wielding a separate weapon in your off hand or a shield. However, you can apply this bonus while gripping the Longsword with two hands using the versatile feature.
• Switching the grip as a bonus action, allows you to change the Longsword damage from Slashing, to Bludgeoning (by half swording), or Piercing (by adopting a more lunge heavy stance). 
• When you make an opportunity attack with the weapon, you have advantage on the attack roll.