Shield Focus

A shield is a nearly impassable barrier in your hands.

Using your shield, you may expend your bonus action to make a shove maneuver against an adjacent creature when you take the attack action.
When you have a shield in your hand, you may apply its AC bonus to dexterity saves made against effects that target you.
While wielding a shield, you may expend your reaction following a successful Dexterity saving throw to take no damage from a spell or effect.