Once on each of your turns when you take the Attack action, you can replace one of your attacks with a body slam using your armor against a creature within 5 feet of you. The target makes a Strength saving throw (DC 8 plus your Strength or Dexterity modifier and Proficiency Bonus), taking Bludgeoning damage equal to your Armor Class on a failed save, or half as much damage on a successful save.
You can use this feature twice. You regain one expended use when you finish a Short Rest, and you regain all expended uses when you finish a Long Rest.