User blog comment:MaddiKitten/Mizure, Carbon, Diamond, and the 5 Base Natures/@comment-25156300-20150114190116

For the multiple natures, I agree with the mastering vs knowing, especially since Mizure is older. However, If it's just for the carbon release, then I think you can keep it simpler. If her shield is made from earth and yin, it is already harder than normal carbon structures, so needing to use fire and wind to heat, reform, and cool seems redundant. I think just saying she can make it diamond hard, purely from the carbon release (earth and yin) is enough. This would also include things like the carbon dioxide and other variations too.

This doesn't mean she couldn't have the other natures, but I don't think you need to say they are used with her carbon techniques. In those cases, it would just be the few minor techniques of each nature that she learns from her years of training. Again, if she were younger, I would say no for having all of them (even at a non-mastered level), unless it was through scrolls.