Brawler

If anyone can be a fighter. Then more than anyone can be a brawler. Brawlers are where many fighters begin their careers; weaponless, armorless, and with just grit and anger on their breath.

Brawlers can come from anywhere. Some gladiators are brawlers. Some thugs and personal security are brawlers. Tavern brawlers have brawler in the name. Your Wizard's bully, Kevin? He is also a brawler.

Brawlers forgo weapons and armor for brute force. Combining the monk's penchant for martial arts, with a barbarian's more destructive tendencies. All wrapped up in the fighter's perfection and training. 

Brawler's Arts

Starting at level 3, you gain proficiency in improvised weapons. And your unarmed strike damage becomes 1d6 + Str Mod. This damage improves whenever you gain a new martial archetype feature according to the table below. This ability doesn't stack with the "Tavern Brawler" Feat.

At the start of each of your turns, you can deal 1d4 bludgeoning damage to one creature grappled by you.

Level 3 — 1d6 + Str Mod

Level 7 — 1d8 + Str Mod

Level 10 — 1d10 + Str Mod

Level 15 — 1d12 + Str Mod

Level 18 — 2d6 + Str Mod

Duck and Weave

Starting at level 3, your time in brawls has improved your reactions. Your unarmored AC become 10 + (Dex Mod x 2)

Aim for the Jugular

Starting at level 7 you become for adept at hitting things where it hurts most. Your unarmed strikes and improvised weapons now critical on 19-20. This improves to 18-20 at level 18.

Heart of the Brawler

Starting at level 10, with your constant training and increasing challenges, you have grown used to punching through most adversity.

Your unarmed strikes count as magical and slivered for the purpose of overcoming resistance and immunity to nonmagical attacks and damage.

Also you add double your CON modifier to your hit points per level.

Bloodied Anger

Starting at level 15 whenever you are under 33% of your maximum health you may reroll any 1's and 2's for attack rolls and Constitution Saves. You must keep  the 2nd roll.

Forged in Blood

Starting at level 18, for each enemy within 5ft of you can reduce any damage you take by 2 (maximum Damage Resistance 10 and to a minimum of 1 damage)