What kills white walkers in Game of Thrones?

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Tags

1. #under
2. #series
3. #walker
4. #night
5. #reanimates
6. #episode
7. #targaryen
8. #wights
9. #kills
10. #daenerys
11. #control
12. #mullan
13. #dragon
14. #destroyed
15. #primary
16. #seventh
17. #portrayed
18. #beyond
19. #wight
20. #season
21. #white
22. #viserion