GoCorral

Legendary Bastion
General Feat (Prerequisite: Level 4+, Shield Master)
You gain the following benefits.
Ability Score Increase. Increase your Strength score by 1, to a maximum of 20.
Shield Slam. While you have a Shield equipped you may use it as a Melee weapon. It deals 1d4 Bludgeoning damage and has the Push mastery property.
Invincible Technique. You can use two Shields at the same time, allowing you to gain the AC bonus from both and attack with both as if you were wielding two weapons.
Explosive Reflection. When a ranged attack roll misses you and its damage includes Bludgeoning, Piercing, or Slashing damage, you can take a Reaction to redirect some of the attack’s force. If you do so, choose a creature you can see within 60 feet of yourself that isn’t behind Total Cover. That creature must succeed on a Dexterity saving throw (DC 8 plus your Strength modifier and Proficiency Bonus) or take 3d4 plus your Strength modifier damage. The damage is the same type dealt by the triggering attack.