Originally Posted by
Lyth
Part of that problem comes down to the fact that the Amaurotians are the only ancient society that we actually know about, so it's natural to have the perception at this point that everything traces back to a single homogenous society. I'm sure that as we 'broaden our horizons' as Emet suggested, we're going to encounter other influential groups as well. The Void is a pretty good starting point for this because they're the other known 'unknown' behind Allag/Meracydia, but I'm sure that we'll encounter other independently developed civilizations at some point.
Perhaps the reason for the plural 'Myths' is to suggest that the 'Twelve' were different groups of people in different stories. We have twelve Thavnairian Zodiac Braves. Twelve Archons rescuing people from the Flood and founding Sharlayan. This storyline might unify those various 'Myths' and give them a common thread.