How do you get monarch wings in hollow Knight?

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Tags

1. #vessel
2. #furthest
3. #basin
4. #level
5. #broken
6. #double
7. #chamber
8. #wings
9. #found
10. #hollow
11. #monarch
12. #ancient
13. #after
14. #progressing
15. #fight
16. #upgrade
17. #bottom
18. #knight
19. #looking