Path of the Eternal

Those who follow the Path of the Eternal channel their Rage into almost endless resolve. Those who follow this path never fall easily in battle and they use their endless resolve to press on in order to achieve their goals.

Eternal Resolve

Starting at level 3 when you choose this Path, you have gained incredible resolve that allows you to press on through almost anything. Thus, you add +2 to all constitution saving throws. Additionally, at the end of every short or long rest you gain 2d6+(your constitution modifier) temporary hit points. Any remaining temporary hit points gained using this feature go away when you take a short or long rest. 

Vitality from Rage

In battle, every swing that you channel your rage into grants you the strength to keep going. Whenever you land a successful attack while in rage, you are healed for 1d4+(your constitution modifier) hit points. This increases to 2d4+(your constitution modifier) at level 11 and 3d4+(your constitution modifier) at level 17.

Perseverance

Your endless will alone drives you forward in such a way that you are almost unstoppable. Starting at 10th level, you gain advantage on death saving throws, additionally you can't suffer more than two levels of exhaustion. 

Transcendent Resolve

Starting at 14th level, you add an additional +3 to constitution saving throws. Additionally, you are able to channel your resolve into your body, and once per short rest you can spend a bonus action to heal yourself for twice your barbarian level. This increases to twice your barbarian level+2d6 if you are raging.