Look again the photo with the loot this spider gives. It’s a drop from the spider, not a skeleton key finding. This means that no matter if it’s an rng droo it probably has better percentage drop from mushashi. So if we say that the best crafting katana cannot touch mushashi and it’s probably too far away, then this drop can create a balance to what’s missing right now in exile lands. I am pretty certain they did the same with short swords and other “new” weapons too. Now we need to search my friend, or wait wiki to tell us where to find what. But no, i prefer searching my self 