The Immortal

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Immortal soul

Upon becoming unconcius, your soul gets transported to a space inbetween planes. While in this space, you can talk to your patron. When you get healed, or you spend more than an hour in the sub-dimension, your soul returns to your body, "reviving" you to 1hp if you have 0hp. If you fail all death saves, your soul dissapates, unless revived.

Patron's Barrier

Your patron, in a moment of distress, grants you a temporary shield. You can use your reaction (when an enemy's attack beats your ac) to use the essence of immortality to generate a barrier. This barrier grants you resistance to all upcoming damage, effectivaly halving all damage against you, until the beggining your next turn. You can use this feature twice per long rest.

Knowledge of Death

At 6th level, your patron grants you the knowledge of death. This grants you resistance to necrotic damage. Additionaly you get advantage aggainst being frightened.

Soul Siphon

Once per turn, after you land a hit with a spell or melee weapon, you can choose to regenerate the damage as health

Undying Patronage

At 14th level, your patron bestows upon you the gift of true immortality. You no longer age and are immune to effects that would magically age you. Additionally, when you are reduced to 0 hit points but not killed outright, you can choose to automatically stabilize without needing to make death saving throws. Once you use this feature, you can't use it again until you finish a long rest. You also gain advantage on all death saves.