How do you unlock Scion in Path of Exile?

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Tags

1. #class
2. #exile
3. #character
4. #least
5. #quest
6. #seventh
7. #available
8. #difficulty
9. #start
10. #currently
11. #consists
12. #scion
13. #three
14. #complete
15. #level
16. #heroes
17. #unlock
18. #normal