Matter condensation

Matter condensation was a technique used by the Master to kill by shrinking a living being - p.e. a cameraman on Gallifrey. According to the Fourth Doctor, his nemesis had picked up the technique "somewhere on his travels", and this way was a "nasty sort of death". (TV: The Deadly Assassin)


 * Unlike it, other known processes of miniaturisation caused no harm to living beings, effecting just the size.