Path of Bloody Fists

Its all in the short one

Bare Knuckles

When you take the Path of Bloody Fists subclass. You gain this ability.

Your Unarmed Strikes gain a bonus to hit that increases at certain levels. Your unarmed strikes are now d12’s instead. And at certain levels you gain additional dice to roll

Lvl 3: +1 to hit

Lvl 6: +2 to hit, additional d6 for dmg

Lvl 10: +3 to hit, additional d6 is now d12

Lvl 14: +4 to hit, gain another d12

Tight Grip

On Reaction to being attacked by a melee weapon. You can attempt to disarm the attacker and evade the blow. The Attacker must succeed a Strength Saving Throw, where the DC is 10 plus half your Barbarian Level. 

If they fail the Saving Throw, The attacker drops their weapon and you may also make an Unarmed Strike against them. This attack does not gain any benefits from brutal strike or Reckless attack. But does gain the benefits of Bare Knuckles.

Again and Again

When attacking with an Unarmed Strike during rage, if your roll to hit is 5 above the enemies AC or more, you may attack an additional time. This has no limit as long as you continue to roll 6 higher. Once you do not roll 6 higher, you may not take an additional attack.
You can do this equal to the amount of rages you have, regaining all uses on long rest and 1d4 uses on short rest. If you use your additional attack, this does not restart the pummeling.

Declaration of Brutality

When you rage, declare an opponent. This opponent feels the weight of the declaration, when attacking someone other than you, this opponent must roll at disadvantage to hit