Concept-Dependent Immortality

Concept-Dependent Immortality
As the original primordial source of all nightmares, Dendar, The Night Serpent (Forgotten Realms) can never truly die or be killed while nightmares exist within the minds of all things.
Power/Ability to:	Be absolutely immortal as long as a concept exists.

"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.

Capabilities

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.

Applications

• Absolute Immortality

Associations

• Concept Empowerment
• Power Manifestation
• Reliant Immortality

Limitations

• Destroying the concept will make the user mortal and destructible. This makes the user weak to users of Concept Destruction.
• 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. 

Known Users

See Also: Anthropomorphic Personification and As Long As There Is Evil.

• Terumi Yuuki (BlazBlue); needs people to hate him in order to live
• The Endless (DC Comics); except Death
• Barbas (Charmed)
• Scathach (Fate/Grand Order)
• Dean Martin (Family Guy)
• Zeromus (Final Fantasy IV)
• Dendar, The Night Serpent (Forgotten Realms)
• Protogenoi (Greek Mythology)
• Heartless (Kingdom Hearts)
• Greek & Roman Gods (Percy Jackson and the Olympians)
  • Pan; via nature
  • Aphrodite; via love
• Mephisto (Marvel Comics)
• The Grey Gentlemen (Momo)
• Nyarlathotep (Persona); via humanity's collective evil and destructiveness
• Philemon (Persona); via humanity's collective good and constructiveness
• Erebus (Persona 3); via humanity's collective desire for death
• Fairies (Peter Pan)
• The Guardians (Rise of the Guardians)
  • Sanderson Mansnoozie/Sandman
  • E.Aster Bunnymund/The Easter Bunny
  • Toothiana/The Tooth Fairy
  • Nicholas St. North/Santa Claus
  • Jack Frost
• Pitch Black/The Bogeyman (Rise of the Guardians)
• YHVH (Shin Megami Tensei)
• Julius (Sword of Mana)
• Coffin Baby (Toolbox Murders)
• Fairies (Touhou)
• Adolf Hitler (The Twilight Zone); as long as people follow his ideas and continue his actions
• Chara (Undertale)
• The Chaos Gods (Warhammer 40,000)
• Lionblaze (Warriors)
• The Djinn (Wishmaster)
• Iblis (Islamic Mythology); in some variations, he won't die before the Apocalypse

Gallery

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.

Fairies (Touhou)

The Guardians (Rise of the Guardians) will live forever as long as the Children of Earth's beliefs in the Guardians remains strong.