What does void Heart do in Hollow Knight?

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Tags

1. #these
2. #charms
3. #unequipped
4. #battling
5. #found
6. #hollow
7. #bearer
8. #special
9. #under
10. #heart
11. #hallownest
12. #unifies
13. #cannot
14. #knight
15. #traversing
16. #charm
17. #provide
18. #buffs
19. #items