Bulwark

The bugbears originaly created bulwarks to be apart of goblinoid host. However few races have picked it up to, others have compeletly banned it and dosen't alow the cruelty that bulwarks show. Bulwarks are still frawned upon do the way they mercilessly destroys their enemies with brutal savagery. Bulwarks emphasies on using shields as weapons, not only win, but otherly crush their unfourtune enemies. Most non bugbears that picks the martiel archtype of bulwars uses their capabilities to help the people around them instead of brutaly kiling.

Bonus proficiency’s

Starting at 3rd level you get to everything needed to make a shield. You gain proficiency with smiths tools and woodcarvers tools.

Additionally you can spend 10 minutes weaponising a shield. If the shield isn’t weaponised you can’t attack with it. 

Shield weaponry

Beginning when you choose this archetype at 3rd level, your brutality allows you to bash through your enemies. You get to use a shield as a weapon dealing 1d4  + strength at 3rd level, 1d6 + strength or dexterity at 7th level, 1d8 + strength or dexterity at 10th level, 1d10 + strength or dexterity  at 15 level and 1d12 + strength or dexterity at 18th level.
When you take the attack action and attack with your shield weaponry. You can make an attack with a weapon you are wielding on your other hand as a bonus action.

When a creature hits you with a melee spell attack or melee weapon attack, are within 5 ft of you and are targeting you and within 5 ft of you. The target takes damage equal to 1 roll of you shield weaponry die. To use this ability you can’t be incapacitated.

Superior strength

Starting at 7th level, your strength and physical might allows you to use weapons that others might struggle with easily. If you are a medium size or bigger and you are wielding your shield weaponry you can ignore the two handed property on weapons you are proficient with.

if you are a small or smaller size you gain a bonus to dexterity saving throws equal to one roll of your shield weaponry die.

Additionally your shield weaponry attacks counts as magical for the purpose of over coming resistances. 

Relentlessly engaged

At 10th level, you can add your shield’s bonus to your initiative.

Despicable intent

Starting at 15th level, whenever you take the shove action you can make a dexterity (acrobatics) check instead of a strength (athletics) check to shove the creature.
Additionally you can make a shield weaponry attack against the creature (with disadvantage) as part of the shove action.

Death is but a dream

At 18th level, you attain the pinnacle of resilience in battle. When you take damage you can make a strength saving throw to take no damage instead (DC = the damage taken). You can use this feature a number of times equal to your proficiency bonus per long rest.