Shield Expert
General Feat (Prerequisite: Level 4+, Strength or Constitution 13+)
You gain the following benefits.
Ability Score Increase. Increase your Strength or Constitution score by 1, to a maximum of 20.
Shield Attack. Immediately after you take the Attack action and attack with a Melee weapon that lacks the Two-Handed property, you can use a Bonus Action to make a melee attack with your shield. The shield deals Bludgeoning damage, and the damage die for this attack is a d4.
Shield Defense. When an attack roll hits you and its damage includes Bludgeoning, Piercing, or Slashing damage, you can take a Reaction to reduce the attackās total damage against you. The reduction equals 1d10 plus your Strength modifier, Constitution modifier, and level.
You can use this feature a number of times equal to your half your Proficiency Bonus (round down), and you regain all expended uses when you finish a Short or Long Rest, provided you have Smith's Tools to repair your shield.