Shield Wall Warrior

You've become a battle hardened warrior of the shield wall. You have learned the intricacies of using a one-handed melee weapon in combination with your shield. You gain the following benefits:

• On your turn, you may use a bonus action to raise your shield. Raising your shield grants a +2 bonus to AC until the start of your next turn.
• Before you make a melee attack with a one handed strength based weapon attack that you are proficient with, you can choose to take a -2 penalty to the attack roll. If the attack hits, you add +4 to the attack's damage. This form of attack cannot be combined with cantrips, but can be applied to Battlemaster maneuvers.
• When standing within 5 feet of another ally who is also using shield, neither one of you can be considered flanked.