Sometimes—but there is no universal answer. A being that does not age, or can live indefinitely under certain conditions, is not necessarily immune to injury or death. Only a definition that means “cannot die under any circumstances” rules out being killed by definition. For a human, a character, or a figure in a religious tradition, the answer depends on what the evidence or that particular story says.
What does “immortal” mean?
The word is used for different claims, and they should not be treated as interchangeable:
- Does not age: the being does not undergo ordinary aging. That alone does not say whether injury, disease, or another cause can kill it.
- Can live indefinitely under some conditions: there is no fixed natural endpoint, but the being may still be vulnerable to particular harms.
- Cannot die under any circumstances: this is absolute immortality. If the definition is literal, the being cannot be killed; a story that gives it a lethal weakness is using a less absolute meaning.
So the useful follow-up is not just “Is it immortal?” but “What kind of death, if any, does its immortality prevent?”
What does science establish about human immortality?
Biology can investigate aging, longevity, and the behavior of cells. The National Institute on Aging describes aging as gradual changes in most body systems and studies processes associated with aging and age-related disease. That is not evidence that a person can avoid death indefinitely, much less survive every possible cause of death. National Institute on Aging: What Is Aging?
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In a 2021 explainer, the NIA recounts how Leonard Hayflick and Paul Moorhead overturned the long-held consensus that human cell samples could replicate endlessly in laboratory cultures. The finding concerns cells grown in culture; it is not a direct experiment measuring how long an entire person can live. National Institute on Aging: Cellular Senescence, Aging, and Disease
Nor does cellular senescence mean that a person is immortal. Senescent cells stop multiplying, but may remain in tissue and release chemicals associated with inflammation and harm to neighboring tissue. Cell behavior, a whole organism’s lifespan, and invulnerability to injury are separate questions.
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The NIA also summarizes research in genetically altered mice in which age-dependent telomere shortening was associated with a shorter lifespan, reduced ability to respond to physiological stress, slower wound healing, and more spontaneous cancers. These are findings about a mouse model—not proof about immortal humans. National Institute on Aging: Telomeres and Aging
Why fiction and mythology can give different answers
In a story, “immortal” is a rule of that story, not a universal biological category. One being might be protected from aging but still die from violence; another might survive ordinary injuries but have a named exception. A religious narrative may likewise describe protection with a particular condition or limit.
For example, a translated passage of the Devi Bhagavata Purana depicts a being requesting a boon that death occur only from a specified type of being. This illustrates conditional protection within that narrative; it does not establish a rule that applies across mythology or to the real world. Devi Bhagavata Purana, translated text
A game document uploaded by a community member describes immortals in its setting as vulnerable to beheading. Because that document is user-uploaded and its edition or canonical status is not established here, it should not be treated as a general rule—or as definitive for a particular game without checking that game’s source material. Community-uploaded game document
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How to find out whether a specific immortal can be killed
For a named character or tradition, look to the relevant source rather than assuming that all immortals share a weakness. Check:
- What does immortality prevent? Does the source mean freedom from aging, an indefinitely extended life, or inability to die?
- What happens after injury? Can the being be wounded or incapacitated, and does the source say those injuries can be fatal?
- Are exceptions stated? Look for a condition, weapon, agent, or other explicitly named limit.
- Which version supplies the rule? Distinguish a primary text or game canon from a translation, later adaptation, or fan-uploaded material.
Without a named story, game, myth, or doctrine, there is no specific canonical method of killing to report. The broad answer remains conditional: some beings called immortal can die under their own rules; absolute immortality, taken literally, means they cannot.
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