Undying Knight

The Undying Knight is a fighter who draws on mysterious powers to overcome death. The enemies in an Undying Knights path have two choices: yield or die fighting. 

Death holds no sway over you, who has unlocked the secrets of everlasting life. Once mortal, the Undying Knight has seen mortal lifetimes pass like the seasons, like the flicker of endless days and nights. It has the secrets of the ages to share, secrets of life and death.

Improved Recovery

Beginning when you choose this archetype at 3rd level, whenever you regain hit points, you regain additional hit points equal to your Constitution modifier (minimum of 1).

Remarkable Recovery

Starting at 7th level, when you are successfully stabilized while dying, you regain hit points equal to your Constitution modifier (minimum of 1).

Undying Nature

Beginning at 10th level, you can hold your breath indefinitely, and you don't require food, water, or sleep, although you still require rest to reduce exhaustion and still benefit from finishing short and long rests.

In addition, you age at a slower rate. For every 10 years that pass, your body ages only 1 year, and you are immune to being magically aged.

Regeneration

Starting at 15th level, you regain 1d6 hit points every 10 minutes, provided that you have at least 1 hit point. If you lose a body part, you can cause the missing part to regrow and return to full functionality after 7 days if you have at least 1 hit point the whole time.

Survivor

At 18th level, you attain the pinnacle of resilience in battle. At the start of each of your turns, you regain hit points equal to 5 + your Constitution modifier if you have no more than half of your hit points left. You don’t gain this benefit if you have 0 hit points.