Eight hundred years ago, the Witch Queen unleashed the Black Plague to wipe out humanity. A band of knights, including a widowed Kaulder, whose family had died in the plague, storm her lair and in the ensuing battle, Kaulder manages to defeat her. Before dying, the Witch Queen cursed Kaulder with eternal life.
https://en.wikipedia.org/wiki/The_Last_Witch_Hunter
Immortality is eternal life, being exempt from death; unending existence.[2] Some modern species may possess biological immortality.
Certain scientists, futurists, and philosophers have theorized about the immortality of the human body, with some suggesting that human immortality may be achievable in the first few decades of the 21st century. Other advocates believe that life extension is a more achievable goal in the short term, with immortality awaiting further research breakthroughs. The absence of aging would provide humans with biological immortality, but not invulnerability to death by disease or physical trauma; although mind uploading could solve that if it proved possible. Whether the process of internal endoimmortality is delivered within the upcoming years depends chiefly on research (and in neuron research in the case of endoimmortality through an immortalized cell line) in the former view and perhaps is an awaited goal in the latter case.[3]
In religious contexts, immortality is often stated to be one of the promises of God (or other deities) to human beings who show goodness or else follow divine law. What form an unending human life would take, or whether an immaterial soul exists and possesses immortality, has been a major point of focus of religion, as well as the subject of speculation and debate.
https://en.wikipedia.org/wiki/Immortality
Undesirability[edit]
Physical immortality has also been imagined as a form of eternal torment, as in Mary Shelley's short story "The Mortal Immortal", the protagonist of which witnesses everyone he cares about dying around him. Jorge Luis Borges explored the idea that life gets its meaning from death in the short story "The Immortal"; an entire society having achieved immortality, they found time becoming infinite, and so found no motivation for any action. In his book Thursday's Fictions, and the stage and film adaptations of it, Richard James Allen tells the story of a woman named Thursday who tries to cheat the cycle of reincarnation to get a form of eternal life. At the end of this fantastical tale, her son, Wednesday, who has witnessed the havoc his mother's quest has caused, forgoes the opportunity for immortality when it is offered to him.[60] Likewise, the novel Tuck Everlasting depicts immortality as "falling off the wheel of life" and is viewed as a curse as opposed to a blessing. In the anime Casshern Sins humanity achieves immortality due to advances in medical technology; however, the inability of the human race to die causes Luna, a Messianic figure, to come forth and offer normal lifespans because she believed that without death, humans could not live. Ultimately, Casshern takes up the cause of death for humanity when Luna begins to restore humanity's immortality. In Anne Rice's book series The Vampire Chronicles, vampires are portrayed as immortal and ageless, but their inability to cope with the changes in the world around them means that few vampires live for much more than a century, and those who do often view their changeless form as a curse.
In his book Death, Yale philosopher Shelly Kagan argues that any form of human immortality would be undesirable. Kagan's argument takes the form of a dilemma. Either our characters remain essentially the same in an immortal afterlife, or they do not. If our characters remain basically the same—that is, if we retain more or less the desires, interests, and goals that we have now—then eventually, over an infinite stretch of time, we will get bored and find eternal life unbearably tedious. If, on the other hand, our characters are radically changed—e.g., by God periodically erasing our memories or giving us rat-like brains that never tire of certain simple pleasures—then such a person would be too different from our current self for us to care much what happens to them. Either way, Kagan argues, immortality is unattractive. The best outcome, Kagan argues, would be for humans to live as long as they desired and then to accept death gratefully as rescuing us from the unbearable tedium of immortality.[61]