Known to rural folk magicians and secret societies such as the Society of the Horseman's Word, the exacting ritual of killing a toad to obtain the bone of power has been documented in various forms and cultural milieus for two millennia, though its origin is likely far older. Focusing on extant forms in Britain and Europe, Chumbley traces the metamorphosis of the toad-bone amulet from its beginning as a talisman for controlling animals to its ultimate manifestation as a conduit of diabolic power of the 'Toad-Witch'. The first academic study of this little-known aspect of folk magic.