A spirit, or immaterial being, holding a middle place between men and deities in pagan mythology.

One's genius; a tutelary spirit or internal voice; as, the demon of Socrates.

An evil spirit; a devil.

Evil creature from another dimension or plane of existance.

A program that runs in the background that is timed to execute or to execute should a particular event happen.

A support mechanism that performs simple decision making and low-level information gathering to aid the main (intelligent) program execute its larger tasks. In an expert system, rules that watch out for exceptions, special conditions, and dangerous situations and suggest precautionary action.

A procedure that is executed whenever a particular predicate about a database becomes true.

A godlike being who preys upon the living is some way, usually possessing some magical powers and living in other dimensions.

A godlike being whose form and functions have degenerated so it preys upon the living in some way.

Magical creatures that can drain Source and take physical form.