Path of the Undying

Barbarians who walk the path of the undying have learned to ensure both physical and mental pain trough the sheer determination to live, but some gain it by losing all of their emotions, including pain, and becoming fearsome terminators. Whether you walk this path in one of those ways, or an entirely different, undying barbarians all share an unparalleled prowess in endurance and life force.

Healing retribution

When you get hit by an attack roll while your rage is active, you can take a reaction to expend one of your hitdice and regain a number of hit points equal to the number rolled plus your constitution modifier and your rage damage bonus. This doesn't apply if you got hit by radiance or force damage

Undying resilience

Increased toughness

Your hit point maximum increases by an amount equal to your barbarian level and your hit point maximum increases by an additional 1 whenever you gain a barbarian level.

Damage resistance 

Your undying resilience grants you Resistance to necrotic and poison damage. Additionaly, you have advantage on saving throws to end the poisoned condition and diseases

Undying rage

Once per active rage, if your hp drops to 0 or below, you can choose to regain a number of hit points equal to the damage just dealt plus your constitution modifier. If the regained hp exceeds your hit point maximum, you gain an amount of temporary hp equal to the hp that exceeded the hit point maximum.

Undying immunity

When your rage is active, you gain immunity to necrotic and poison damage as well as immunity against the poison condition and diseases. You also dont need to sleep, eat, drink and breathe, but you still gain the benefits from finishing a short or long rest. But you still can suffer from exhaustion points. Additionaly you have advantage on death saving throws and you can't suffer more than one death failure at a time

Ready for undeath

As a bonus action, while your rage is active, you can give yourself immunity to bludgeoning, piercing and slashing damage until the start of your next turn. You can use this feature a number of times per rage equal to your constitution modifier (minimum of once)