Fragmenter

The Fragmenter was a Kyren weapon, developed shortly before their invasion of Earth. It worked by breaking down the bonds which held an organism together, turning them into dust. In order to operate the Fragmenter, an eight-digit code (79917010) was required. This code was given to Emily Whitaker by a time-travelling Doctor. She was able to provide it to him later on, where he used it to defeat the Kyren invading force.