Path of the Feral

If a man carries a weapon with discipline, they call him a knight. If a man wields a weapon in anger, they call him a barbarian.

But what if a man himself becomes a weapon?

There are no laws or rules. There are no traditions nor etiquette. There is only survival, and the victory with which it comes. Power through any source. Victory through any means.

A Feral beast.

Feral Strikes

When you choose this path at 3rd level, you can roll a d4 + your strength modifier in place of the normal damage of your unarmed strikes. This die grows as you gain barbarian levels. When you use the Attack action with an unarmed strike on your turn, you can make one unarmed strike as a bonus action.

This die increases as you gain barbarian levels, to a d6 (5th level), d8 (11th level), and d10 (17th level).

Rampage

At 3rd level after choosing this path, when you use your Rage feature you may spend a hit dice to go into a Rampage.

Whenever you use your Reckless Attack while Rampaging and wielding no weapons, you may add a roll of the hit die spent as weapon damage to the attack. The Rampage lasts until your Rage ends.

Additionally, as an action you may spend a hit die to regain a charge of Rage.

Undying Rage

Beginning at 6th level, while in Rampaging you may ignore damage from any attack up to an amount equal to your number of already spent hit dice.

Ravage

Beginning at 10th level, when you roll a critical hit with a melee attack, you may choose for your attack to target everything within 5 ft. of you. The attack hits every target within 5ft. with an AC lower than the attack roll.

Additionally, as part of a normal attack action, you may expend a hit die to invoke this effect for all your attacks until the end of your turn. 

Feral Wrath

Starting at 14th level, when you have no hit dice left, you may double the damage bonus received from raging to your unarmed attacks.