Killmaster 18

Killmaster 18 is a fictional character devised by the Umgah with the sole intent of terrifying the Spathi using the former's HyperWave Caster. Other similar Umgah pranks played with the help of the Caster include the Grand Master Planet Eaters and Jud the Ineffable Vug (the Spathi claim not to have fallen for the latter prank, although this is doubtful, given their cowardly nature).