Caliane
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mind blown
For the curious, the Night’s King of the books is the legendary 13th Lord Commander of the Night’s Watch. He fell in love with a mysterious, white-skinned, blue-eyed, ice-cold woman, declared her his queen, and did generally bad things for 13 years in the North before the King in the North and the King Beyond the Wall joined forces to end his reign. While there’s no confirmation that the Night’s King of the book was real or that his bride was a White Walker, that interpretation seems to be the most likely conclusion from the tale.
In the books, then, what is the threat from beyond the wall, just wildlings and random white walkers?
According to George R. R. Martin, the Others "are strange, beautiful… think, oh… the Sidhe made of ice, something like that… a different sort of life… inhuman, elegant, dangerous
ice elves.
https://awoiaf.westeros.org/index.php/Others
They are established as an entire civilization of evil ice Fey, who worship the Great Other