Path of Annihilation

When a barbarian embraces the power of their fury, openly indulging in the complete destruction of anything around them, they subscribe to the path of annihilation. Proponents of this path take glee in making nothing out of something and embrace their reckless nature to ensure complete destruction. The sight of the complete undoing of friends or foes can strike fear in those who dare to battle close to such an adversary.

Ghastly End

Starting at 3rd level, your rage brings out the inner need to destroy. Once per turn while raging, when you take a foe to 0 hit points on a attack using the reckless attack feature, you can release that pent up fury to completely annihilate them. The sight of this display is staggering to foes around you. Enemies within 10 feet of the spectacle must make a constitution saving throw equal twice the damage rolled on the dice for the hit that resulted in the death. On a fail, they are paralyzed in fear until the end of your next turn. On a save, the foe can use their reaction to move up to half their movement speed away from the gruesome display without provoking an opportunity attack due to the barbarians focus on their target, but they may not attack them until the start of your next turn due to their unwillingness to engage you right away. You may use this ability PB+1 times per day.

Unmade

Also at 3rd level, when you are raging and hit an inanimate object, you can choose to focus your need to break and do maximum damage. When you attack recklessly and target an inanimate object, roll damage and add another maximum roll of your damage dice to the roll. You can do this PB+1 times per day

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Remade

Beginning at level 6, your pursuits of destruction  have gained you insight into how things are made. You gain proficiency in medicine, and 2 of the following: carpenters tools, smiths tools, glassblowers tools, masons tools, leatherworkers tools, and potters tools.

Revelry

You have made a life of destruction, and your expertise is still growing. While raging, whenever you take a creature to 0 hit points using the Ghastly End feature, you gain temporary hit points equal to the damage rolled on dice that killed it + half your level in this class. These points do not stack and reduce to 0 when your rage ends. You also gain advantage on intimidation checks against any creature that saw the death happen until your rage ends. 

Feeding the Need

You have begun to understand what drives you, and the need to destroy. Destroying fuels you, and beginning at level 14, when you bring a foe to 0 hit points, you may use your reaction to make a melee attack to a creature within 5 feet of where you stand.