Just found out it's from the MB guidebook.
You have a link to that? Can't find any online
You have a link to that? Can't find any online
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Three of them (Unskilled, Lady Guitarist, and Sword Looks) are used since we see them described/used elsewhere. Unskilled is briefly described later in the manga, and Lady Guitarist and Sword Looks are described in the LNs.
Do you still want me to grab links to threads for this stuff? It'd be a slight pain in the ass to, ngl, since they're buried in random old threads.