There exists a world that exists apart from our own, call ot a world beyond world's if you must. this world has existed alongside the human race without us even being aware of it, a world of magic and conquest.
The ancients had some awareness of this world but knowledge of it has long since been lost ever since the dark ages. The truth is that this world is a threat to mankind. The ones who lie above it are called the apex species and they dominate all and everything around them. They answer to noone not the world governments and certainly not even the church. Their powers are mysterious and far exceed that of what hinges on common sense.
Like a force of nature, they cannot be reasoned with nor bargained with and they will do all that is necessary to stay at the top of the world even wiping out half of mankind if they have to. However the truth is that they can never do that. They need mankind, particularly its blood and daughters in order to continue their dominance over the world.
They are met with resistance from various factions in the world but their rule perseveres... that is it used to...
Ever since the death of their all powerful ruler this species has lost its reigns on the world. their pillars are falling apart and they even face struggles for supremacy amongst themselves.
This has caused the world hidden from man to undergo various changes in structure and thee chaos that exists till this very day. The chaos and the struggles have become so apparent that even humans have started to perceive its aftereffects in supernatural events they call witch attacks. No-one not even their governments can describe the causes of these disasters.
Only a few humans know, they know about the existence of this world, a world that comes alive after dusk, a world the ancients called Night World. They also know that without a clear King, the creatures of night world will act in accordance with their own desires and wreak havoc upon mankind in the pursuit of supremacy...
They know, that without the Night King, Night world will fall upon mankind and devour it completely.