Immortality

The Alpha Vampire - an example of an immortal being.

Immortality is the ability to live forever, and not being subjected to aging or disease. Longevity is the ability to have an extended lifespan above humans, but not live forever. Mortality is the exact opposite of immortality.

Known Holders

Absolute Immortality

These beings are truly eternal, completely indestructible and absolutely immune to age, disease or any form of injury; they cannot be destroyed or killed, only banished or locked away for eternity.

The Shadow - An extraordinarily powerful and mysterious entity that holds near-absolute power within the Empty, a place of infinite nothingness predating the Archangels, Death, God, the Darkness. It is the oldest known thing in all of existence, and appears to be completely invulnerable since it survived a magic bomb that would have killed both God and the Darkness.

Near-Absolute Immortals

These particular beings are considered to be constant, nearly completely indestructible and immune to age and disease, although they are not completely indestructible and can still be banished or killed.

• The Darkness - A primeval yet infinitely destructive cosmic force that has existed alongside God, only her brother is able to kill her, with the help of the Archangels.
• Lucifer (formerly) - As an archangel, Lucifer was already virtually indestructible, next to invincible and has existed long before the creation of The Universe, Creation, and the concept of time itself, but as the former bearer of the Mark of Cain, Lucifer was completely indestructible, next to completely invincible and unkillable
• Four Horsemen of the Apocalypse - Horsemen's physical embodiments can be killed by Death's Scythe, but their attribute can never die.
  • Death - Death was nearly completely invincible and couldn't be killed except by his scythe and the Darkness.
• God (formerly) - Death claimed that he would reap him at the end of time, but he died before this could be tested out. His older sister, The Darkness, is the only being that has the power to kill him, and the combined might of the four archangels could severely weaken God enough to be killed.

Advanced Immortals

These particular beings are nearly completely indestructible, and are immune to age, viruses, toxins, and disease. However, they can still be killed through the use of extremely powerful special weapons, powers or rituals, and nigh-omnipotent beings.

• Archangels - Archangels have an infinite lifespan and aren't subject to time, even their vessels are unaffected by age, toxins, viruses, poisons, illnesses, infections, infestations, irritations, natural death, physical trauma, blood loss, or diseases, they also don't tire, and dont need to breathe, eat, drink, rest, or sleep to sustain themselves or their vessels. They are much older than Creation, and are much older than The Universe itself, making them more than 13.8 billion years old. They are among the oldest beings in all of existence. They're nearly indestructible, next to invincible, but the only objects and weapons that can hurt and kill them is the Lance of Michael, Death's Scythe, and an Archangel blade, the only beings in the whole universe that can kill them is God, Death, The Darkness and Jack Kline..
• Akrida - The Akrida are immortal in a variety of senses, having an ageless lifespan, meaning they simply do not age. The Akrida cannot be killed by nothing in Earth, the one way to kill them is using soul-powered magic on their Queen.
• Eve - Eve is immortal and cannot die of disease, natural death, or old age. She was older than humans, demons, souls, and even the angels (except Archangels) she can only be killed by Phoenix Ash.
• Leviathans - Being creatures older than mankind, demons, souls and angels. Leviathans are immortal and virtually indestructible, in a variety of senses, having an ageless lifespan, meaning they simply do not age. Leviathans cannot be killed unless by two means, one of which - a weapon - was devised by God. The other way for them to die is for them to be eaten by another Leviathan, or for the Leviathan to eat itself.
• Knights of Hell - High-tier Knights can only be killed by the First Blade powered by the Mark of Cain, or by the Archangels, God, the Darkness, and Death.
  • Cain - As he bore the Mark of Cain, he could not be killed by anything with the exception of the First Blade.
  • Dean Winchester (formerly) - As a Knight of Hell and with the Mark of Cain, he is virtually indestructible and immortal. Unless he transfers the mark to someone else, and is killed by The First Blade, Dean will never die neither by natural or supernatural means. It is highly implied that he cannot kill himself with the blade, as it had no effect on him when he slit open his hand.

Higher Immortals

• Angels - Angels, even in their vessels, are nearly indestructible, do not age and cannot be killed by diseases, toxins or Earthly weapons.
• Demons - Demons do not age and cannot be killed by conventional means.

Other Immortals

• Alphas - As the very first of their species, they have been around for an extremely long time without aging. They can potentially live forever.
• Crocotta - They have a longer life span than humans, able to live for centuries.
• Deities - Pagan deities can live forever as they are immune to aging and disease. Many have been around for centuries or even thousands of years. Each one has a unique way to be killed.
• Djinns - Djinns can possibly live forever.
• Doc Benton - His method of immortality had nothing to do with magic, at least in the ritual/spells sort of way, only science which was apparently of his own creation. It's stated by him that there is a formula, suggesting that it was an alchemical procedure. He did however, steal other people's organs and body parts to replace his own when they ran down, or got damaged, this is most likely out of convenience though, as he can still act normally, when they are damaged beyond repair. He was also able to give others the formula, and thus his powers.
• Golem - As a non-biological being, it doesn't age or die by conventional methods.
• Nachzehrer - Nachzehrer do not age and cannot be killed unless they are beheaded with a copper coin in their mouths.
• Kohonta - A kohonta has the capability to live for centuries.
• Phoenix - Phoenix are immortal and they do not age. A Phoenix is immune to death by natural causes and aging. Based on Elias's comments, it seems before the Colt, there was no known way to kill a Phoenix, although the fact it was known that they combust upon death, implies there are other ways to kill them, though that could have been a paradox.
• Luther Shrike - Granted immortality inside of his property by Barthamus after blackmailing Barthamus with his human bones. Could be injured but not killed inside of his property as a result. Outside of his property, Luther was vulnerable to being killed.
• Shtriga - By feeding off life force, the Shtriga can live for an extended period of time.
• Vampires - Vampires can potentially live forever. They can not grow old and aren't affected by conventional diseases that affect humans.
• Wendigo - Wendigos can possibly live forever, or at least for hundreds of years.
• Kappa - Kappas can live over 100 years old.

Simple Immortals

These are beings who could live forever and are immune to age and disease, however they can die as easily as mortals from physical wounds.

• Clive Dylan
  • Wizard of Oz
• Eleanor Visyak
• Inyo
• Lily Sunder
• Oskar
• Randa Moreno
• Adam
• Witches
  • Don Harding
  • Don Stark (presumably)
  • Lia
  • Maggie Stark (presumably)
  • Patrick
  • Rowena MacLeod
  • Tracy Davis
  • Charlie
  • Methuselah
  • Clea

Trivia

• It is unknown what can actually injure and/or kill a Cambion (a human-demon hybrid). It is also unknown whether they can live forever or whether they grow old similarly to normal humans. However, Castiel attempted to use the Demon-Killing Knife to kill Jesse, a Cambion, so it can be presumed that at the very least at Castiel's opinion/belief, it can kill him (albeit, the actual effectiveness was never shown).
• As stated by Billie that everything living in Death’s Library has a Death Book a self-writing book detailing the circumstances of one’s ultimate demise. Thus implying as part of the Natural Order that in the span of eternity circumstances will work to end the life of anything alive. Whether or not something is ageless or is extremely difficult to kill.
• It seems that, despite the varying levels of immortality, the Shadow is the only truly immortal entity, impossible to kill because it is not alive.

See Also

• Indestructibility
• Invulnerability