After some thought, I have decided to combine the idea of a tennis ball machine with a treadmill. This is the item my character uses for her training in the lair. This is just a rough drawing to get my idea. How this hero prop function is when the clockwork priestess starts running, arrows will start shooting out from the machine and she will kick away or dodge away from it.
Phil, do you think this will work or should I still use the scepter but it is made of "real world" elements?