Path of the Wrathful

Barbarians of this path are often those who have been through great strife or had an otherwise harrowing experience. 
These warriors are pushed to continue on their journey by their rage, often on a mission of vengeance. They are given greater power with this explosive and often fiery fury within; gaining powers suitable for the monster they often become. Though not reserved for evil creatures, the violence these barbarians are capable or inclined to enacting is suitable for such evil creatures, or antiheroes of questionable morals.

Savage Brawler

At 3rd level, your spiteful malice allows you to beat down the opposition, your unarmed attacks deal 1d6 + your Strength Modifier damage, this is called a Wrath Strike.
You can choose to make this damage Fire before the damage is rolled. This damage increases to 1d8 at 5th level, 1d10 at 11th level, and 1d12 at 14th level.

Additionally, you gain the ability Unyielding Fortitude to overcome grave wounds through your rage.
Upon entering a state of rage, you can roll and heal from a number of your hit dice equal to your Constitution modifier (minimum of 1).

Iron Will of the Bloodlust

By 6th level, your resolve overcomes any attempt to sway you from your course. When charmed by a creature, this does not prevent you from attacking it; you ignore similar effects that would prevent you from attacking a specific creature, such as the Sanctuary spell or Instinctive Charm feature.
Additionally, your unarmed strikes gain the ability to overcome resistance to non-magical bludgeoning damage.

Adamantine Resolve

At 10th level, while raging you are also resistant to the damage types Fire, Acid, Lightning, Thunder, and Cold. 

Call to War

At 14th level, while you’re raging, any creature within 5 feet of you that’s hostile to you has disadvantage on attack rolls against targets other than you or another character with this feature. An enemy is immune to this effect if it can’t see or hear you or if it can’t be frightened.