Immortal

Immortals are beings who are immune to death through any conventional means, which is what separates them from regular mortals. There have been instances where a mortal or demigod has been gifted with immortality by the gods, usually as either a reward for great heroism (e.g. to Heracles) or so that they may be united in marriage with a god (such as in the cases of Psyche and Eros also Dionysus and Ariadne).
==Characteristics==
Immortals are immune to death in any form. They don't age, nor can they die from poison or disease. They are immune to all weapons that mortals use, as they are not forged from magical metals such as Hephaestian Bronze, Stygian iron, Gold, or Bone Steel. If their bodies are somehow harmed or destroyed they will eventually reform, though the length of this process can vary from days to centuries.
===Limitations===
====Greco-Roman Gods====
The immortality of the Greco-Roman gods, Titans and monsters has its limits:
*Void of Chaos: Chaos is believed to be one of the few things able to truly kill an immortal (possibly by permanently absorbing their divine essence with it being impossible for it to ever escape), as Zeus held Hera over Chaos after her rebellion, threatening to drop her into the void.
*Fading: Immortals can "fade" away into nothingness, ceasing to be, should they lose the will to live or be forgotten or their realms are weakened enough, which has happened to several immortal beings, such as Helios, Pan and Selene. Harpocrates was able to will himself into fading from existence, taking the immortal Cumaean Sibyl with him who also desired a final end.
*Scattering: If the body of an immortal being is damaged enough, they may be weakened into a state where they can no longer reform for many centuries, at the very least, even to the point of not being able to gather a complete consciousness. Uranus, Cronus, and Gaia are the only known immortals to have succumbed to this fate. The extremely few weapons powerful enough to destroy the bodies of immortals in such a way are Skybender, Zeus' master bolt, and Poseidon's trident.
*Tartarus Essence Absorption: The infernal Lord of the Pit Tartarus has the ability to suck beings into the swirling whirlpool of darkness on his face, which he did to the immortal essence of Hyperion and Crius. In that sense, Tartarus can technically "kill" gods, Titans, and giants by absorbing their immortal essence into his armor for very lengthy periods of time.
*Seat of Power Destruction: Immortals are always severely weakened when their thrones (representing their seats of power) are destroyed. Zeus ultimately used this method to prevail against the Titans at the end of the First Titanomachy and Cronus was almost successful in using the same method against the Olympians at the end of the Second Titanomachy. The Giant King Porphyrion theorized that a similar yet even more severe weakening of the Olympians could be achieved by destroying the Athenian Parthenon, as it was located at the gods' "roots" as the original Mount Olympus was located in Greece.
*Secure Imprisonment: Immortals can be sealed away in extremely secure prisons, such as the bronze fortress in the depths of Tartarus, which was the fate of most of the Titans. Atlas was notably imprisoned on Mount Othrys, unable to leave while the incredible weight of his celestial burden rested on his shoulders.
*Magic: According to Apollo, magic to destroy a god is entirely possible if they are powerful enough, provided their victims are weak enough to be overcome. Magic also can drain a god’s power and immortality and granting it to someone else.
*Immortality Revocation: Zeus has shown the ability to revoke the immortality of his fellow gods and turn them into mortals, having done this three times to Apollo. However, in Apollo's case, his powers appeared to be bound more than stripped as he still had bursts of godly power.
====Egyptian Gods====
The immortality of Egyptian gods has its limits as well:
*Killing and Duat Banishment: Egyptian gods can be banished back deep into the Duat either by being killed, which is possible, or by ensnaring them through very powerful and effective magical items. A magician can also banish them through certain spells that require their secret names or through execration. However, they will eventually return, as killing a god just kills their mortal body and drains their power, and the banishment will eventually end.
*Shadow Execration: Gods can actually be permanently destroyed if a magician casts an execration spell on their sheut. This is because if a person casts no shadow at all, their existence is meaningless. Destroying a sheut cuts all ties to the mortal world that a being has as well as the fact that the sheut is an important part of the soul. This is used to destroy Apophis, though it takes the combined power of [UNKNOWN CHARACTER] as well as Horus and Isis to do so without Carter and Sadie being destroyed in the process. Gods keep knowledge of this secret so it can't be used against them, as a magician threatening to execrate their sheut is effective blackmail against them.
*Dependence on Ra's Life Force: If Ra the sun god is missing, the gods start to lose power slowly. Worse, if Ra is somehow destroyed (via shadow execration, for instance) all the other gods are destroyed as well.
*Energy Depletion: Bastet mentioned that it is possible for gods to cease to exist if they expend too much energy without stopping to rest. However, this is clearly quite a lot, as Bastet and Apophis dueled continuously for thousands of years nonstop but did not cease to exist.
====Norse Gods====
Norse Gods are perhaps the most vulnerable of all. While being beings of great power and are seemingly unable to die from old age, they are able to be killed quite easily by other gods, monsters, and even mortals (Kvasir was killed by dwarves). Norse deities enter the underworld when they die, and can be returned to the land of the living (as is the case for Baldr and Kvasir). Almost all the Aesir are destined to permanently die during Ragnarök.
==Heroes==
In both ancient mythology and in the series, heroes who have been distinguished for remarkable talent have been given the choice to become immortal. However, it is possible for the chosen hero to reject the gift.
In order to create an immortal, Gods must give up a piece of their own immortality, their powers. They cannot create a deity stronger then they are, only weaker as power trickles down not up. The more power they give, the weaker they become.
=== Dionysus ===
Dionysus was once a demigod son of Zeus. He was made immortal for helping the gods greatly in The First Giant War.
===Heracles===
Hercules was the son of Zeus. He was a great hero known for the Twelve Labors Of Heracles. The gods recognized that and he was made immortal upon his death.
==Einherjar==
Odin's einherjar cannot be killed while they remain within Valhalla and will simply keep resurrecting from mortal wounds every time until Ragnarök.
They do not, however, have this ability outside of the hotel while they visit any of the Nine Worlds, where they are rendered completely mortal. 
==Hunters of Artemis==
The Hunters of Artemis are Artemis's loyal maidens and sisters-in-arms. They have sworn an oath to her, vowing to remain a virgin forever. With this, they gain eternal life and youth by her side. They cannot die from disease or age, but they can die in battle. If they break their vow to Artemis by falling in love, they are once again rendered mortal. Callisto said she felt different after Artemis revoked her oath.
==Giants==
The giant children of Gaia and Tartarus are immortal and will heal from mortal wounds at incredible speeds, unless killed by the combined efforts of a demigod and a Greco-Roman god. It is also possible for a demigod and a Titan, as shown when the Titaness Hecate helped kill her bane Clytius.
====Alcyoneus====
The only one of the giants with a different form of immortality is Alcyoneus, as long as he remains within his native territory (Alaska in The Son of Neptune), and will regenerate after mortal wounds at incredible rates, with or without godly assistance. However, when taken out of that territory, the giant can be killed by any means.
==Monsters==
While monsters can age, most monsters can't die as mortals do and will eventually come back. Whenever a monster is killed, their essence will return to Tartarus and reform, allowing them to return to the mortal world. This is true for almost all monsters, giving them some form of immortality as they can never truly die. However, the time it takes to reform can take anywhere from a few days to a few centuries to a few millennia.
Like the gods, monsters can fade from existence if they lost their will to live and if people don't believe in them, like in the case of Pan, they will fade from existence. In the case of Briares' brothers, they had faded because no one believed in them, but Percy suggested that they also stopped believing in themselves. The same can happen to monsters if not enough people remember them, but Gaea managed to find a way to reverse this somehow, as she brought back Medusa's sisters, who Medusa had claimed faded in The Lightning Thief.
==Demons==
Nymphs and satyrs can be considered immortal in the sense that they will never die of age. They are, however, subject to death by other means.
===Satyrs===
Satyrs will be reincarnated into something in nature if they die, such as a laurel.
===Nymphs===
Nymphs, such as Dryads and water nymphs, can live forever, as long as the thing their life-force is tied to isn't destroyed (plant life and bodies of water respectively). If their life force is destroyed, they will die as well.
Category:Groups
Category:Immortals (TOI)
Category:Immortals (SOB)
Category:Immortals (COH)