"I call her Fiddler’s Bane," Myfanwy grinned, wickedly. "There are a lot of deviant wizards out there ... Muggles, too ... who might fancy fiddling with a young witch travelling on her own, and you cant always rely on being able to quick-draw your wand. This handy weapon is the bane of such intent. The club is imbued with a highly focused Bludgeoning Charm, so even the daintiest of taps will shatter the firmest of encroaching wrists. You’ll get twelve hits out of it before the Charm wears off ... hopefully you wont need them, but just in case ..."