The Aurora Kingdom — or formerly known as Australia — used to be one of the humans' strongholds scattered throughout five continents.
Eventually, at some point in history, the inhabitants of Australia encountered a mass alteration — turning them into an entirely new race — Naturekinds — was what they called themselves.
Personally, Achilles thought it was a shitty name and whoever came up with that must be the biggest moron ever.
...Ahem, anyway, there was a simple reason why they named their race like such — the alteration they went through had morphed most of them into beings that carried natural wildlife creatures' characteristics.
Elves, boars, cats, dogs,...so on and so forth.
Back then, an elf woman — the ancestor of the Aurora family — gathered the inhabitants under her wing only and renamed Australia — the Aurora Kingdom.