Unfailing

It would be impossible to find a more dedicated bodyguard than one of the Unfailing, the incredibly resilient order of warriors charged with protecting Hollowfaust’s high-ranking necromancers. Unwilling to let even death impede them from performing their duties, they continue to serve their masters well beyond the point when other mortals would succumb to their wounds. Many of their abilities arise through their close association with the necromantic powers of their homeland.

Harm’s Way

When you choose this archetype at 3rd level, you may place yourself in harm’s way to protect an ally or ward. When a friendly, willing creature within 5 feet of you is attacked, you can use your reaction to switch places with that creature and become the target of the attack instead. You must be able to see the target and the attacker to use this ability.

Unnatural Toughness

Also at 3rd level, each time you finish a long or short rest, you gain a number of temporary hit points equal to 5 + your fighter level.

Deathless

Starting at 7th level, while you are wearing heavy armor, any bludgeoning, piercing, or slashing damage that you take is reduced by an amount equal to your Constitution modifier. This feature is not cumulative with similar abilities from feats, magic, or other sources.

You also have advantage on saving throws against any spell or effect that would kill you instantaneously without dealing damage, including death saving throws.

Fortified

Beginning at 15th level, you have resistance to necrotic damage. When you roll initiative and have no temporary hit points, you gain a number of temporary hit points equal to your fighter level.

Undying

At 18th level, you possess an unnatural vigor akin to that of the undead. At the start of each of your turns, you gain temporary hit points equal to 5 + your Constitution modifier.

You don’t gain this benefit if you have 0 hit points.