Fighter: Black Prior

Black Priors are warriors who strongly believe in war and battle as means to achieve their own purpose, and are determined to carry out their task whatever the cost may be. Their fighting style is unusual, while shields are commonly used for defense, they use it as part of their brutal attacks, and their strength allows them to withstand attacks from multiple enemies without flinching. Although they are formidable warriors, their warring spirit stops them from backing out of fights, which makes them look reckless most of the time, and they have a bad reputation for sometimes using dark magics. Disclaimer: It is very, very recommended to pick Protection fighting style for this archetype. Otherwise, your experience while playing this archetype may be hindered.

War Rising

Beginning when you choose this archetype at 3rd level, your prowess with your shield allows you to use it offensively. You become proficient in Smithing tools, and whenever you perform a short rest, you can choose to spend it upgrading your shield using basic smithing materials (such as nails, scraps of iron, steel, etc) to add edges and or sharpen parts of your shield so that it can damage incoming enemies. Your shield damage is equal to 1+STR modifier (minimum of 1)., and the damage type is determined by how you craft the shield (E.g: Piercing damage if its reinforced with nails, Slashing if you attach sharp edges to it, etc). Each time you perform the Shove action on a creature succesfully, the creature receives the shield damage aswell. Whenever you use your Protection fighting style feature to defend an ally against a coming attack, if the attack misses, the attacker receives shield damage.

Bulwark stance

At level 3 as well, you may bunker down behind your shield attempting to block any incoming attack. You may activate or deactive Bulwark Stance with a bonus action during your turn. Alternatively, when you use your Protection Fighting style feature, you can choose to enter or exit Bulwark Stance. In Bulwark Stance, you get a +1 bonus to AC, but your speed is halved, and any incoming attacker that doesn't get through your AC takes your shield damage. You may not attack using your attack action while in Bulwark stance, but you may take oportunity attacks, and you may use the Shove action.

Darkened Protector

At 7th level, your thirst for battle and conflict increases greatly, but at this point, you are almost unable to back down from a fight as your strength gives you confidence. Whenever a creature that you can see dies within 30 ft. of you while you are conscious, you regain an amount of health equal to the creature's CR, but if you were to retreat from a battle, you would have to succeed a WIS saving throw of a DC equal to 10+ STR modifier, and upon failure, you would not be able to take the Disengage action on your turn or move more than 10 ft. away from a creature you are engaged with. You can retry this save each time your turn starts.. Additionally, you can now use your Protection Fighting style feature up to a 30 ft. range. If you use it on a target that is located further than 5 ft., you will have to do a small sacrifice, inflicting upon yourself damage equal to your shield damage to invoke a sinister projection of yourself to guard the ally you chose.

Additionally, the damage from your shield becomes magical.

Hawk's Charge

At 10th level, whenever you move at least 15 ft. straight towards an enemy, you can perform a Shove and a follow-up attack as a bonus action. This feature and the bonus attack may be used while in Bulwark Stance.

Bulwark Counter

At 10th level as well whenever an enemy, or a group of enemies is attacking you with melee attacks while you are in Bulwark Stance, you may try to perform a Bulwark Counter as a reaction. If its a single enemy, make an Athletics (STR) check contested against its attack. If it fails, you take the damage normally, but if it succeeds, you use your shield to flip the enemy over your head and land behind you knocked prone and taking shield damage. As part of the same reaction, you may attack the creature with a single melee attack. If its a group of enemies attacking you at the same time with melee attacks, make an Athletics (STR) check against the highest rolled attack, with disadvantage if the group of enemies consists of more than 3 attackers. If you fail the check, you take the damage normally, but if it succeeds, every enemy affected by the reaction is flipped over your shield and falls behind you, taking shield damage in the process. As part of the reaction you may perform a sweep with your melee weapon that cannot miss and deals to each enemy flipped over damage equal to your weapon's max damage divided by the number of enemies affected by the counter. You may perform a Bulwark Counter only on creatures of Large or smaller size. You can use this feature an amount of times equal to your STR modifier (min. of 1) per long rest.