In the Game world, there were many races about.
Tens of thousands of years ago, there were disputes amongst the various races, which resulted in the biggest and most tragic war of the Game world.
In the end, the humans won and took over the biggest portion of it.
All the other races retreated and hid themselves.
The Undead Race at the Extreme Lands of the North; the Atlantian race at the Atlantis Sea territory; the Hybrid race of the Wild Lands, and the Titan race, which is only heard of in legends.
The tragedy of war that happened tens of thousands of years ago caused those races to remain in hiding. And it was only now that the world was somewhat peaceful on the surface, where each race wouldn't bother the other, that there would be sightings of them.
There were actually a plethora of conspiracies going on, but that will be glossed over for now.
The Fur-Tailed demon race is one of the myriad races in the world.
