A hand weapon found inside a Slaver stasis box that reshapes itself into several different devices, the most dangerous being a beam that converts matter entirely into energy.
The device gives its name to the episode The Slaver Weapon. Taken from a stasis box by the Kzinti commander known as Chuft-Captain, it has a sliding control with a series of settings, each of which changes its form.
Among them are a telescope, a laser, a personal rocket and an energy absorber. Sulu and Spock deduce that so varied a tool was made for a spy rather than a soldier. A hidden setting produces a total conversion beam of enormous power.
A further setting wakes a reasoning computer. Questioned by Kzinti who cannot give the proper codes, it concludes that it has fallen into enemy hands and directs them to a setting that destroys the weapon and its captors together.