Path of the Fist

Your anger and might are so extreme, you can longer focus on swinging weapons. Your rage imbues your fists to deal additional damage, and even overcome resistance and immensities. 

Mighty Blows

Beginning at 3rd level, your unarmed strikes use a d4 damage.

This increases to a d6 at level 6. A d8 at level 9. A d10 at level 12. A d12 at level 15. And a d20 at level 18.

Rage Empowered Strikes

Your strength is paramount. Starting at 6th level, when raging, your unarmed strikes overcome all types of resistances and immunities.

Unarmed Master

Beginning at 10th level. After two successful unarmed strikes on your turn, you can spend your bonus action to perform an unarmed strike, with one of the following effects. The save DC for some effects is equal to your 10 + proficiency + STR modifier 

Grappling Strike - If the attack hits, you make a grapple check against the target.

Shoving Strike - If the attack hits, your target must make a STR saving throw, or be pushed 10 feet away.

Crippling Strike - If the attack hits, your target must make a STR saving throw, or be knocked prone.

Staggering Strike - If the attack hits, your target has disadvantage on all attack rolls until the start of your next turn.

Biting Strike - If the attack hits, it does piercing damage instead, and you gain temporary hit points equal to the damage dealt.

Brutal Strike - if the attack hits, you roll one additional die when determining damage.

Large Swings

If two creatures of huge size or smaller, are standing adjacent to each other, your unarmed strikes can hit both targets at once.