What are rubies used for in Pixelmon?

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Tags

1. #armor
2. #tools
3. #sometimes
4. #obtained
5. #smelting
6. #tutors
7. #their
8. #magma
9. #blocks
10. #material
11. #certain
12. #payment
13. #decoration
14. #require
15. #services
16. #storage
17. #rubies