“This hammer strikes a point where a magic is unstable. It’s also known as the magic key, since it fixes most horns on the first strike. Like a key to open a door.” Now that I look at it, it looks like one of those hammers doctors use to strike knees. Since horse knees are oddly flexible in this universe, and I don’t know if they use hammers on real horses, they’ll find a use for it somewhere. 