Demonology

Demonology  Segment 13

http://riverbendparanormal.blogspot.com/2011/04/demons.html is all about demons.

Demonology is the study and classification of the hierarchy of demons, their powers and limitations, attributes, multiple names, and derivations, as well the investigation of beliefs about demons. Demons, when regarded as spirits, may belong to either of the classes of spirits recognized as human, non-human, separable souls or discarnate spirits which have never inhabited a body. A sharp distinction is often drawn between these two classes, notably by the Melanesians, the West Africans, and others. The Arab djinn, for example, are not reduced to modified human souls; at the same time these classes are often thought as producing diseases.

Demonology, though often referred to with negative feelings, was not always seen as evil or devilish as the term would have one believe. The word demonology is derived from daimon meaning "divinity, divine power, god."
Some societies believe that all affairs of life are under the control of spirits, each with their own "element" or even object and even themselves in subjection to a greater spirit.