There are 10 unique skills, but they never mentioned how many rare skills there were. The rare skills are supposedly unlockable though, in that anyone who meets the requirements will get them, and this information is shared between players. Unique skills are unique.
I suppose it's possible that "Dual Axes" is a merely a rare skill unlike "Dual Blades" but I think it's more likely that the anime staff just didn't think about it very much.
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