There is a tradition, right across the Multiverse, of macho law-enforcers toting ridiculously heavy sidearms, which surely represent overkill for normal policing duties. Dirty Harry had his .44 Magnum; Detritus carries a siege weapon weighing two thousand pounds. As Detritus considers this a waste of energy if all the energy devoted to drawing back and cocking the string is only expended on a single arrow (which from a human point of view is a six-foot lance), he has adapted it still further, so that it fires a bundle of twenty or so arrows wired together around a central core. Due to the violent force acting on them, the arrows tend to disintegrate into a cloud of supersonic (a significant fraction of local light speed) shrapnel which bursts into flame from air friction. The resulting fireball scythes everything in its path totally clean. Hence the name. It not only opens front doors, but frequently creates a back door as well.
— Terry Pratchett
The Piecemaker is a powerful siege crossbow edited into the most awesome sidearm ever used in law enforcement by none other than Sergeant Detritus the Troll himself (granted, Mister Vimes has explicitly forbidden its use in most cases).