In the realm that was hidden from the public eyes, creatures living in the shadows were living in violence where the cruel demon hunters were killing everyone that left the sanctuary. Killing and suppression had been maintaining the status quo for a long time. In the beginning, human beings were weak. They survived only because the demon hunters and the unusual creatures were busy killing each other. Later, when human beings became more powerful, the demon hunting went underground but remained the key to maintaining the balance.
But now the demon hunters were no longer able to continue with this kind of killing as they had lost the reason and motivation to do so. So a new 'authority' was needed to maintain the world order.
This was not only to protect humanity, but also the old unusual creature families. These ancient families, which were sensible and cunning, were well aware of this as this would also lay the foundation for their benefits.