Six Platinum Dragons were born around Eximagdra. The moment this happened was the beginning of a new era, the calendar reset, and it was named year 0. These six Dragons changed the species around then, and gave birth to powerful places of magic, the Altars of the Eximagdra. It is from these Dragons the other Dragon species came.
When these six were born across the continent, the places they were born and their local populations were completely transformed, with some species ending up almost irrecognizable from what they used to be.