any books about the ramifications of death dying/being sealed away leaving everyone and every plant/animal immortal and how that is actually a really horrifying situation the more you think about it?

yes i know about the terry pratchett death books.

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and i dont want something where death is just taking a short vacation, i want 1000+ years of an immortality apocalypse, maybe full grimdark, maybe death returns at the end

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sci fi, fantasy im good for anything

by TheXypris