Reality Bomb
A Reality Bomb was a device which could “disintegrate universes”.
The Crew of the Copper-Colored Cupids had at least one Reality Bomb in Storage. It took the form of a “large, shiny lump of extratemporal dynamite with a long, winding ectoplasmic fuse”. The Department of Problem-Solving pretended to detonate it in order to lure Lord Thymon, knowing that he would show up and stop them before it actually exploded. (PROSE: Lord Thymon and the Department of Problem-Solving)
A Reality Bomb called a Mark IV Peace Bomb, originally property of the Unified States Reality Service and bearing the best-by date “best before 3 March 2267”, was one of the items accumulated in the closet of one incarnation of Jenny Everywhere's apartment. When she and Kim went through the closet to sort its contents, Kim was horrified that something this dangerous was in storage in their home, and convinced Jenny to drop it into the ocean in some uninhabited universe. (PROSE: Cleaning Day)