How do you get crystal weapons in Dark Souls?

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Tags

1. #ability
2. #requisite
3. #upgrading
4. #giant
5. #crystal
6. #souls
7. #creation
8. #weapon
9. #after
10. #weapons
11. #requires
12. #receiving
13. #blacksmith
14. #ascend
15. #gains
16. #titanite
17. #ember
18. #standard
19. #chunks