A copper mug containing a thick, shiny, black grease. The grease sparkles in the light, as if filled with flecks of some gemstone or precious metal. When the grease is applied to a stuck item, be it held in place by a curse or some other means, there is a 5-in-6 chance it loosens the item enough for easy removal. But if it fails, the grease hardens and makes the item even more difficult to remove.