No, you can't. The only thing the weapon is good about is to lower your atk so that mobs can live longer to test out your skills, in case you're bored of Mushin dummies. In another hand... search for the weapon name, and you will see its sealed variants on the marketplace.
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Quietus Anyone else having problems with Youtube at the moment? For some reason it's looking very bare bones on my computer. Everything is listed in a single column.