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1

all forms of immortality makes immortal people suicidal. someone who dies, but reappears again in the same form will reach a point where they no longer want to live, and will move heaven and Earth to find a way to die for good. this person will never be happy, and will make it their never ending quest to find a way to finally no longer exist. being immortal ...


2

Hawk Girl and Vandal Savage sorta have this already. Except one is a superhero and one is a supervillain. Hawk Girls dies and is reborn as the same person with all her memories from her past lives. Memories and powers tend to come flooding back in high-school, she does something heroic that makes the papers, and Vandal Savage starts tracking her down ...


2

Don't speak the name of the Devil: Many cultures have prohibitions of speaking of or naming evil beings.It is believed that these beings are called up or their attention drawn to the speaker. Why not apply this on a global scale? After all, when faced with clear proof that demons exist, and another clear prohibition not to speak their names, who wouldn't ...


1

The ancient civilization blames it on the gods. As a result, a modern, secular society does not believe in it and believes it to be a myth much like the Biblical flood.


4

Demons have a propensity of attacking more advanced civilizations. Cities and even standalone buildings like farmsteads and temples would see a thorough destruction, while indigenous people who don't build any permanent structures may not see any demons at all. As a result, every civilization which has reached the level of cities (and literacy) would get ...


5

The answer is already there in your question: demons. According to the Bible, several thousand years ago, the entire planet was under water. Most modern people refuse to believe this because it suggests a supernatural explanation. Demons are a silly superstition that only scientifically backwards people could possibly believe. We're "enlightened" ...


6

Adding a non-fiction perspective to Patricia Shanahan's excellent answer It's believed that something like this has happened, multiple times. In and around Mediterranean around 1177 BC in the span of a few short years the Minoan culture vanished, as did what's now believed to be several cultures further west disappearing entirely, known collectively as the ...


7

The demons are so traumatic and out of the ordinary that many survivors convince themselves that it didn't happen. They blank out the actual demons, or think they are hallucinations stemming from the trauma. Possibly the magic of the demons adds to the effect. Discussion of the demons might be regarded as poor taste, or even actually dangerous. "...


2

This race of humans might be very aggressive and opportunistic. They would constantly be warring amongst themselves for territory and domination, making accurate record keeping difficult as it is near impossible to stay out of the conflicts. This is how knowledge can easily be lost to future generations (the library of Alexandria springs to mind). When a ...


11

The old tales aren't taken seriously because science wasn't and still isn't very advanced in your civilisation. The Greeks kept records but they made little distinction between actuality, heroic tales and the activities of gods. The current scientists might say, "Oh well, something might have happened but maybe a volcano erupted and spread ash across ...


19

I suggest reading Isaac Asimov's 1941 novelette "Nightfall". It is very similar to your plot, depending on an eclipse that happens once every 2,000 years causing a global catastrophe. Civilization never lasts more than 2,000 years before collapsing. Each time, the eclipse fades into myth and religious texts before the cycle repeats. The story ...


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