It's probably a mischief demon. Kelkor, or—
―Jenny Calendar[src]

Kelkor was a mischief demon. During the inadvertent release of Moloch the Corruptor into the internet, Jenny Calendar assumed that Kelkor might have been responsible for the nuisances experienced by computer users. Jenny attributed the power surges and on-line shutdowns to Kelkor, or some other mischief demon. However, before she could go on, Giles revealed that it was Moloch who was responsible.