How do I unlock Death Knight?

Related questions

1. How did Illidan become blind?
2. How do you get to Legion in WoW?
3. Are you only allowed one demon hunter?
4. Do I need to buy Legion before Battle for Azeroth?
5. How many DH can you have?
6. Can demon hunters use swords?
7. Do you have to buy legion to play Demon Hunter?
8. Do demon hunters start at level 1?
9. How much is legion WoW?
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Tags

1. #required
2. #requires
3. #creating
4. #server
5. #december
6. #character
7. #death
8. #previously
9. #class
10. #existing
11. #players
12. #above
13. #longer
14. #unlocking
15. #knight
16. #level
17. #first
18. #unlock