Shield Basher

You have learned that a large metal or wooden object makes for an excellent smashing board.
You gain the following benefits:

Ability Score Increase. Your Strength increases by 1, to a maximum of 20.

Smashing Board. Shields count as a martial weapon which you are proficient in. They have the following weapon properties:

You also gain the ability to use the Weapon Master Property of Shields. If a shield grants you an extra bonus to your AC due to it's properties as a magic item, you add that bonus to your attack and damage rolls with that shield as well.

Stand Behind Me! If you make an attack with your shield and have not moved this turn, you may use your bonus action to raise your shield, ready to defend your allies. All allied creature have three-quarters cover while within 5 ft. of you, until the start of your next turn. During this time, your speed becomes 0.