Your offensive shield techniques have been honed beyond that of a shield master. You gain the additional benefits while you are wielding a shield:

• If you take the Attack action on your turn, you can use a bonus action to strike the creature with your shield doing 1d6 bludgeoning damage
• As an action on your turn, you can choose to throw your shield as an Attack up to a distance in feet equivalent to  8 + your strength modifier + your proficiency bonus.  On a hit the character takes 1d8 bludgeoning damage and is knocked [condition]Prone[condition].
• While performing a Dash in a straight line, you can lift your shield as a battering ram causing 1d6 bludgeoning damage to each creature within that line without provoking any opportunity attacks from those creatures.  Each creature must make a DC10 Dexterity Saving Throw.  On a successful attempt, the creature is shoved 5 ft to the left or right, your choice.  On a failed attempt, the creature is knocked prone in addition to the 5 ft shoved.