Demons are usually associated with evil, but pre-Christian and non-Christian cultures state that they are not necessarily good or evil. There are good demons and bad demons, and there are those that are both good and bad. Good demons were called eudemons and acted as guardian spirits to guide and protect humans. They were considered lucky to have. Evil demons, that would lead a human astray, were called cacodemons. Christian demonology has come to associate demons with evil since they are the agents of the devil, and the good spirits belong in the ranks of angels of the Lord.
Demonology is the study and classification of demons. The earliest cataloguing and ranking of demons has been documented since A.D. 100-400. The 16th & 17th century Christian demonologists catalogued demons into hierarchies of hell. They recognized demon characteristics and duties, including ambassadorships to different nations. Johann Weyer devised a complex hierarchy of demons in 1577 with an estimated 7,405,926 demons and 72 princes.
According to the Bible, when Lucifer was cast out of heaven by God, demons were the fallen angels who followed him. The demons only purpose was to tempt humans into wicked acts and estrange their relationships with God.
Amon, the demon who terrified me, is one of those demons.