how did the writers get ideas of such supernatural things?

Much of it comes fromtheir cultural heritage or the mythology of their native lands.

Others are musings, the 'what if' questions that pop into our head.

We have all heard of demonic possession, right? QWell, what if we take it a step further and have a demon living in a school boy, as he just needs a place to hide out where it's relatively quiet. But then he discovers it's not all that quiet, but he's kind of stuck for a place to be.

Or you can make one up.

The Brain devourer. This is a kind of vampire demon spirit that takes over a person and feasts on their brain to survive andhave that person do their bidding, but when the brain is consumed, the person dies andthey must move on.

If you have a creative mind, you can come up with any kind of terrifyin beast.....like Teletubbies
 
People have strange dreams too of which there seems no earthly reason for having.
 
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