Jackknife

When a Kobold is defeated and disappears, a Jackknife is left behind around 33% of the time. It's a small folding knife that is categorized as a One-handed Sword. Because so many appear for sale, they are melted down and used as an ingredient in copper coins. They can be sold to the Adventures' Guild for 10 nars each. First appeared in 『Chapter 23』 of the web novel.