In this world, there are eight different races that coexist with humans. It is said that these races were once part of the great human race that rules the world's eight kingdoms now due to how powerful they are than the other races.
But, the Ancestors of the eight races were once members of the human kingdom's royal family.They were the remaining eight children of the sacred king who gave humans a chance to survive the onslaught of the magical beasts, excluding his ninth son who inherited his father's throne to the kingdom.
The sacred king felt bad for his other eight children and gave each of them new powers and a shining stone from his crown which held immense power. He made them promise that they will coexist peacefully and protect the world from the dangerous magical beasts.
Hence the other eight races were born.