Military action
Phostra begins its war on the elves and dwarves, subjugating both.
After settling in the north and seizing some valuable resources, the then Phoenix King declared non-humans as impure much as the Anima and set to destroy the kingdom of dwarves and elves, intending to make them all slaves or kill them. The fighting took a long time but after taming the north, Phostra had made its claim.