Demonology

Demonology is the study of demons or devils (generally, spirits inimical to one's interests or aims). It extends backwards into pre-historical times and seems to associate with personal and cultural struggles. Conventionally within Christian culture it is characterized as 'the study of personifications of evil through time' and this may or may not include some notion of an anti-god.

Contact

The contact with demons is usually achieved by summoning, though more often than not this is advocated by the enemies of demons for purpose of thrill-seeking or tormenting them for extortive advantage. The bare minimals reputed for such contact in the spirit world are the names and symbols associated with the spirit being sought.