recalcitrant

a subclass made to be hard to die

Undead Fortitude

Starting at 1st level, if damage reduces your hit points to 0, you must make a Charisma saving throw with a DC of 5 + the damage taken, unless the damage is radiant or from a critical hit. On a success, you drop to 1 hit point instead.

After the saving throw succeeds, you can't use this feature again until you finish a long rest

Undead Nature

Beginning at 6th 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 stop aging, and cannot die by natural causes (dying of old age, etc.)

Relentless Nature

At 10th Level you gain the following features:

• If you are below half your hit point maximum at  the start of your turn, you regain 1 hit point. 
• If you die, you return to life 24 hours after death.  If your body is destroyed, you reform within 1  mile of the place of your death at a spot  determined by the DM. If your equipment was  also destroyed, you do not regain it. 

Indestructible Life

When you reach 14th level, you partake of some of the true secrets of the Undying. On your turn, you can use a bonus action to regain hit points equal to 1d8 + your warlock level. Additionally, if you put a severed body part of yours back in place when you use this feature, the part reattaches.

Once you use this feature, you can't use it again until you finish a short or long rest.

Expanded Spell List

This subclass lets you lets you choose from an expanded list of spells when you learn a warlock spell. The following spells are added to the warlock spell list for you.

Spell Level	Spells
1st	Bane, Shield of Faith
2nd	Aid, Zone of Truth
3rd	Aura of Vitality, Beacon of Hope
4th	Aura of Life, Death Ward
5th	Antilife Shell, Contagion