What pickaxe is needed to mine cobalt?

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Tags

1. #shark
2. #amounts
3. #breaking
4. #decreasing
5. #hardmode
6. #immune
7. #destroyed
8. #first
9. #lowest
10. #requires
11. #spawn
12. #explosions
13. #reaver
14. #pickaxe
15. #mining
16. #albeit
17. #cobalt
18. #altars
19. #types
20. #molten
21. #least
22. #altar