Nothing that'd make it clear that this thing works, no. That's why I asked, [they gesture, trying to get Shadow to take the feather back.] because anything I tried wouldn't work. It'd only make sense if this thing were imbued with a magic I can't do, because if I used it and did cast it, then that proves it works! You see?

What'd be the point of having a focus for something you can already do? It'd be like a weather wizard stocking up scrolls of lightning bolt - they already do that!