Path of the Deathless

Barbarians are known for their almost supernatural endurance. It's extremely hard to kill even a normal barbarian, but it for one that follows the path of the deathless, that feat becomes nearly impossible.

Through a means not widely understood, path of the deathless allows a barbarian to regenerate even grievous injuries almost instantly. This power is limited only by the barbarian's rage, so as long as they stay in the heat of battle, they can keep fighting almost indefinitely.

This power is not to be confused with immortality, as many who have wielded it have met grisly ends thinking that they could not be killed. But if you are able to temper your rage with caution, the path of the deathless could make you a truly formidable warrior.

Vital Blood

Starting at 3rd level, your body amplifies the effects of any healing it receives. Add your constitution modifier to any healing you receive, including from your own abilities.

Regeneration

Starting at 3rd level, you can use a bonus action to recover a number of hit points equal to 1d6.

Lethal Vitality

Starting at 6th level, getting hurt only makes you more dangerous. Taking more than 10 damage from a single attack while rage is active adds 1 to all your attack rolls until your next short rest. This stacks up to your strength modifier.

Natural Selection

Starting at 10th level, taking damage of any type gives you resistance to that damage type if you don’t already have it. This lasts until your next short rest.

Rush of Blood

Starting at 14th level, taking damage while raging gives you an extra attack on your next turn. The number of extra attacks depends on how many different enemies have damaged you since your last turn.