How do I get to the land of challenge Xenoblade?

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Tags

1. #portal
2. #summons
3. #arena
4. #completes
5. #which
6. #challenge
7. #activated
8. #battle
9. #unlocked
10. #expansion
11. #collects
12. #ruins
13. #serves
14. #nopon
15. #accessed
16. #player
17. #chapter
18. #olethro