User blog comment:B214/Question and Answers 6/@comment-36.72.199.46-20161213181208/@comment-9595671-20161214133006

And not just the Shinto myths, we only have a little bit of other myths mentioned too. I'm pretty sure before Volume 21 that the series never even mentioned the Egyptian myths, it made me begin to think that in the Great War, some myths became extinct.

Though I'd actually find that a good concept to focus on, as well as showing us more about parts of the myths that died during the Great War. We know the Dragons were once much greater but took a major hit, and since Trihexa's attack was like a second Great War, the timing would be just right for it.