Fire drone
From Tardis Wiki, the free Doctor Who reference
Fire drones were weapons used by the Sorvix. Vorsun used some in 3Sol's attempt to kill Tyler Steele. (AUDIO: Changes Everything) The Cardiff Bay Intelligent Hotel and Spa used fire drones to kill the people inside it. (AUDIO: Superiority Complex) Ben modified them for Oblation, after which they would give the homeless the choice between death or injection with experimental drugs. (AUDIO: Hostile Environment)
