What is a seasonal hero in Diablo?

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Tags

1. #items
2. #earned
3. #leveling
4. #scratch
5. #normal
6. #paragon
7. #opportunity
8. #start
9. #allows
10. #recurring
11. #previously
12. #hardcore
13. #fresh
14. #seasons
15. #optional
16. #months
17. #should
18. #every
19. #materials
20. #character
21. #levels
22. #without
23. #season