On what basis or with what reference was the White Walker induction ceremony included in the Game of Thrones episode "Oathkeeper" (S04E04) and where is it referred to in the books?
This is not mentioned in the books. No one had ever seen it before.
This can mean two things:
- This will be in one of the next books; hence the TV Show is starting to spoil the book series.
- This won't happen in the books, and it was just on the show.
Either way, we cannot know what that scene meant/was based on/referenced/whatever until the next season and/or book come out