Cacodemon n. : An evil spirit; a devil or demon.

Cacodemon n. : The nightmare.

Example:
How can I make the Cacodemon jack-o-lantern shown here?

Taxonomy
Cacodemon, evil spirit, free encyclopedia, Cacodaemon, good spirit, eudemons, Games, demons, summoning spell, creature, third edition, Ancient Greek, daimon, Dungeons & Dragons, search, Unsourced, Latin, neutral spirit.

Defination from the web:
... In fantasy video game Baldur's Gate II: Shadows of Amn, the Bioware Infinity Engine equivalent of the "Cacodemon" spell is known as "Cacofiend" ...