Board Thread:General Discussion/@comment-173.81.211.150-20141102151710/@comment-25555436-20141123155532

The first Faunus was born in an alternate universe, where Sonic didn't reset time after Sonic 06, instead spending more time with Elise. Then stuff happened, and everyone died but some of that Faunus' descendants, while some Humans survived but lost all they had and in time lost almost all their knowledge, until they found Dust, Remnants of the Chaos Emeralds.

And the rest is history.