Where is the heart of the fortress Diablo 3?

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Tags

1. #inner
2. #creation
3. #diablo
4. #souls
5. #malthael
6. #built
7. #within
8. #powered
9. #citadel
10. #around
11. #nephalem
12. #found
13. #fortress
14. #final
15. #crucible
16. #heart
17. #confrontation
18. #waiting
19. #largest