Demons of ignorance

The Demons of Ignorance are the antagonists in the Norman Juster book and MGM 1970 film The Phantom Tollbooth. They are hideous creatures that have the power of Malice, Prejudice, Cruelty, Hate. The Demons of Ignorance even fused together to become a large demon. Luckily, Milo killed the demon with a magical rocket pencil after it injured Tock.