Bulwark

Bulwark fights use their shield offensively and defensively and control the battlefield with their imposing presence. They are great at counter attacks and can make room for their allies to escape or change position. 

Shield Expertise

Beginning when you choose this archetype at 3rd level, when you are wearing medium or heavy armor and have a shield equipped you get a +1 to your armor class.

Shield Combat

Starting at 7th level, you can use your shield to flip an enemy that attacks you, bash an enemy as an attack, or guard against hits with your shield. 

Shield Counter - When an enemy up to one size larger than you hits you with a melee weapon attack, you can roll a Strength (Athletics) check, if the result is higher than their attack roll they are thrown over you with your shield, and land prone on the opposite side of you. You can use this feature five times before needing to take a long rest. 

Shield Bash - When you take the attack action on your turn, you can choose to bash with your shield. Make an attack adding your strength and proficiency bonus to the roll, on a hit the target takes 2d4+STR bludgeoning damage and shoved 5ft back. 

Shield Guard - As a bonus action on your turn, you can guard with your shield to add your proficiency bonus to your armor class until the start of your next turn.

Shield Expertise Improvement

Starting at 10th level, when you are wearing any armor and have a shield equipped you get a +2 to your armor class.

Shield Combat Improvement

When you reach 15th level, your skills using a shield in combat are increased allowing your abilities to be more effective.

Shield Counter - When you throw an enemy with your counter, they are left open for an immediate follow up attack. The amount  of times you can use this feature increases to seven times before you need to take a long rest. 

Shield Bash - When you hit an enemy with shield bash you now deal 6d4+STR bludgeoning damage and shoves the target 10ft back.

Shield Guard - When you use a bonus action to shield guard, the increased armor class can also be applied to an ally within 5ft of you. 

Heightened Durabilty

When you fall below half of your maximum health while wearing armor and a shield you gain resistance to bludgeoning, piercing, and slashing damage from all sources.