How do you unlock the broken Isle world quests?

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Tags

1. #unlock
2. #unlocked
3. #zones
4. #level
5. #reaching
6. #khadgar
7. #quest
8. #uniting
9. #isles
10. #characters
11. #friendly
12. #requires
13. #world
14. #account
15. #broken
16. #quests
17. #complete
18. #completed
19. #legion