Path of the Revenant

The red dragon lands on the party, not one of them expected it. The jaws masticates one, tearing ligaments, crunching bones. Incinerating the mangled body, as a burst of flames burst out of its maw,  turning the broken remains black as molten rock. The ancient mighty wyrm disposes of the adventurer, who's thrown violently towards the ceiling of the enormous cave. The body hits and begins free falling, aproaching the floor quickly. Eyes open wide,  the cadaver moves agai, stretching each limb, and falling to the hard ground. The hero stands, as visible bones, muscle, and a missing eye reshapes slowly. Pressured strings of air course from deadly wounds. Returning to battle once more, the revenant regains a mighty furor, fit to fight once more.

Every Barbarian can attain a power to recieve and inflict wounds with heightened mortal might. Only the revenant can utilize their body to asupernatural degree. Their regenerative capabilities work unlike any medicinal means,utilizing energy infused with their rage to regrow destroyed body parts. You fury as a revenant fuels every physical ability on short bursts and protects your body from even the most powerful blow. 

Barbarous Flesh

Beginning at 3rd level, efforts to cripple you are squandered as your body contorts and reforms, unharmed by the elements. When you rage and take damage, you may use your reaction and become inmune to  any damage, except for psychic and radiant until the end of your next turn. This ability cannot be used when unconscious. The ability can only be used once per rage.

Unchained Sacrifice

When you reach 6th level, as a last resort, you disable any sense of danger or fear in an instance, and deliver a catastrophic attack to your foe, but the exertion will cost heavily. While raging and attacking a creature, in addition to the weapon damage, you can deal 1d12 piercing, bludgeoning, or slashing damage, depending on your weapon damage type. Your weapon attacks score a critical hit on a roll of 19 or 20. You deal double damage to objects and structures. At the end of your rage,  you suffer one level of exhaustion.

Concentrated Restoration

Beginning at 10th level, your mind learns to utilize your renewal capabilities to reform the body at astounding speeds. Once per rage, you can use a bonus action to spend one or more Hit Dice to heal plus your constitution modifier. If you expend your Hit Dice with this ability until you have half or less left, become incapacitated until the end of your next turn. You now regain all of your expended Hit Dice on a long rest. 

Superior Body

After arriving at 14th level, your body works forcefully to an exertive and painful degree, but all damage and injuries are easier to mend. While raging and using your action, you can take the following effects. All creatures  in your 5ft width, 80ft height aura make a dexterity saving throw, taking 4d12 fire damage on a failed save, or half as much on a successful one (The spell save DC for this ability is 8+constitution modifier+proficiency). Every time you regain hit points before your rage ends, choose the maximum number when healing. This ability can only be used once per rage.