Why was night king created?

Related questions

1. Is Jon Snow a Targaryen or a Baratheon?
2. How did Aegon's dragons die?
3. What does the Bible say about coincidences?
4. What do the white walkers do with the babies in Game of Thrones?
5. Do you believe in coincidences?
6. Is coincidence a fate?
7. How did Balerion the dread die?
8. How were white walkers created?
9. Who is buried at Winterfell?
10. Are there dragon eggs in Winterfell?

Tags

1. #westeros
2. #white
3. #sacred
4. #background
5. #invaded
6. #before
7. #created
8. #forest
9. #their
10. #children
11. #captured
12. #cutting
13. #themselves
14. #became
15. #defend
16. #among
17. #first
18. #slaughtering
19. #walker
20. #night
21. #trees
22. #walkers