"Didn't they tell you, Jack? It's great being a Guardian! But there's a catch. If enough kids stop believing, everything your friends protect - wonder, hopes, and dreams - it all goes away. And little by little, so do they." ― Pitch Black explaining the Guardians' powers to Jack (Rise of the Guardians)
The power to
be absolutely immortal as long as the concept they are attuned to exists. Variation of Absolute Immortality and Reliant Immortality.
The user is truly immortal as their existence is tied to a certain concept. As long as that concept exists, the user will never truly die in any way.
Destroying the concept will make the user mortal and destructible. This makes the user weak to users of
Nonexistence and Absolute Destruction can erase/destroy the user. User can still go through immense levels of mental trauma despite the concept being active.
User can be weakened or constrained.
See Also: .
Anthropomorphic Personification and As Long As There Is Evil
As long as love is alive in Italy, Dean Martin (Family Guy) will live.
Gaining their life energy from cigars made of saved time, the Grey Gentlemen (Momo) can't die unless they loose their cigars or humanity stops saving time.
As the embodiment of humanity's collective evil, Nyarlathotep (Persona series) cannot ever truly die as long as even a single human has a negative or destructive impulse, thought, or feeling.
Philemon (Persona series) is the embodiment of humanity's collective good. As long as even a single human has a positive or constructive impulse, thought, or feeling, he cannot die.
As long as even a single human desires death, Erebus (Persona 3) cannot be permanently killed. If his body is somehow destroyed, he'll regenerate it within a year.
Coffin Baby (Toolbox Murders) needs death and the Lusman Arms to continue existing.
The Guardians (Rise of the Guardians) will live forever as long as the Children of Earth's beliefs in the Guardians remains strong.
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