Path of the Reaver

Reavers are warriors who have unlocked a new level of control over their bodies. They command this untapped energy from deep within blood and bone. The Reaver path however is a double edge sword. The Reaver specialization trades pain for strength, by channeling their own life force into raw power and stealing the life from their foes. Reavers terrorize their enemies, feast upon the souls of their opponents and become more powerful as they begin to die. It is not so easy, however, to learn this gift, as it comes from the ritually prepared blood of a dragon.

Blood Frenzy

When you choose this path at 3rd level, you can imbue your Rage with minor blood magic. While raging, your damage increases by 1 for every 10 hit points missing from your hit point maximum (temporary hit points not included).
You can use a bonus action to deal 5 damage to yourself.

Devour

Starting at 6th level, you can consume the life force of fresh corpses to heal yourself. By spending 1 minute with a body, dead for no longer than 1 hour, you heal 5 hit points per barbarian level.

Aura of Pain

Beginning at 10th level, the blood magic of your rage becomes even stronger. Each creature that starts its turn within 5 feet of you while you are raging (including yourself) takes 1d4 necrotic damage. This damage cannot be resisted or overcome through immunity and the aura persists for as long as you are raging.

Fervor

Starting at 14th level, you have learned to draw power from the transition between life and death. Whenever a creature dies within 10 feet of you, you can use your reaction to attack an enemy in your range.
Additionally, you make your first death saving throw with advantage.