3

This, and a lot of other similar "unexplainable" horror effects occur in the book, too. (As Dean Koontz repeatedly asserts, he is not a horror writer, but a writer who uses horror effects.) However, there is an in-world explanation, and it's conveniently the same as the meta-explanation you offered yourself: "Was it...just to add a creep factor?" Yes, ...


2

The Ancient Enemy wanted the people to know about it, as you said it wanted Flyte to "write the gospel". It thought itself to be superior than anything else and it actually wanted nothing else than boast with its supposed superiority. So in order for the people to fully see and admire/fear the majesty of the Ancient Enemy they had to fully understand it. ...


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