shield master

a master of the shield 

shield attack

When you choose this archetype at 3rd level, you gain the ability to attack with your shield with witch you are proficient, this attack uses your STR modifier + proficiency bonus and does d8 + your STR modifier Bludgeoning damage. Along with you gain a +1 to your AC while wielding a shield

shield throw

Starting at 7th level, you have mastered the ability to use your shield as a thrown projectile and have it return to you. As an action, you can throw your shield at an enemy, using both your strength and proficiency modifiers.Your thrown shield has a 30/60 ft range, and deals 1d8 piercing, slashing, or bludgeoning damage, depending on your modification of the shield. In any attack roll except a 1, the shield returns to you. You can catch it and re-equip it as a bonus action.

protection mastery

Starting at 7th level, as an reaction you can protect allies with in 5feet you would be attack the enemy would roll with disadvantage, and if the ally has to make a saving throw they get advantage 

better shield usage

At 10th level you add your proficiency bonus to your shield's normal armor rating.

trade of blows

when and enemy attack and deals damage you can make an attack back with disadvantage.

shield recoil

when every an enemy makes a failed melee attack on you they take 1d4 force damage