Not all tales are true, as is to be expected. Sometimes there are blatant lies, sometimes a story is made up, and sometimes parts are left out. When the three species of ponies came to Equestria, it was a land they knew they could inhabit, but it would take time. The horrors and monsters and ponies that quickly followed the discovery of Equestria are often left out to prevent bad rumors and the nightmares of children. But one of the monsters from that period of time is much alive.
A lot is subject to change with this story because it is not complete. Depending on feedback, I will finish it or I won't.