The Electric Coil Rifle, a staple of magnetic weaponry, and a standard by which such weapons are measured.
The basics of magnetic weaponry in the Cosmic Era
An alchemist enchanted his equipment to produce even more powerful alchemical compounds, potions and the like. Unfortunately, it is not well-known that he had different sets of equipment for different processes: If the wrong set of gear is used, the result will invariably fail to function. It's not a cursed item, just something that's hard to figure out.