In the second definition of the term, demonology is, as a field, the study of demons as myth. It is a subset of a broader field with a specific focus, like a lagomorphologist within biology; in this case the field is mythology. Mythology is commonly divided into two main areas: upper mythology, concerning the gods, the heavens, benevolent beings, etc., and lower mythology, concerned with the underworld, evil gods, the restless dead, ancestor spirits, demons, and similar figures (Willis 1993). This separation into two main branches is simply due to the fact that human beings have always thought in dichotomies, so naturally we categorized our world into concepts of “good” and “evil”; the same delineation may be used in a study of such things stemming from our myths (Eccles 1991). Demonology is just a subset of lower mythology, simply the study of the myth of demons.
First, demonology can be defined as an actual belief system, one of faith of a particular people, which is outside the realm of science and a matter for religion. The Etoro, of New Guinea, for example, have a belief in different malevolent spirits and thus a system of demons that explains how these beings work within the framework of the rest of the world and other realms beyond human experience. This is demonology’s first definition: a system of mythological categorization of malevolent beings within a greater mythological system particular to a group. Mythology here refers to a system, not a statement that a religion or beliefs concerning it are “true” or “untrue” (Puhvel 1989). The succubus, for example, was originally part of the system of beliefs in ancient Sumeria, a female demon that would have sex with men during sleep (Rosen 2008). Today this could be interpreted as an explanation for nocturnal emissions or sleep states such as sleep paralysis. Any group can have a system of demonology, one that explains what type of evil, malevolent beings exist, perhaps also how and why they interact with the world, often to explain things unknown. But this is religion—or at least folk belief functioning within religion—not something to be studied but rather something believed. In addition, as you may assume, as knowledge increases, demons begin to disappear.
Most demonologists have studied under others in an educational setting that typically revolves around folklore or anthropology, sometimes sociology. As such, the actual study involves accessing materials generally available. Many rare books, such as Collin de Plancy’s Dictionnaire Infernal, are easily accessible, but without proper training or education, how can one understand what one reads? Demonology requires knowledge in history, archaeology, theology, mythology, sociology, medicine, and psychology. Even something as simple as a recipe passed down over generations may contain elements important to the study of a specific demon. Garlic and the vampire, for example, were tied together long ago, and the herb plays a large role in Eastern European cuisine even to this day, largely because of that connection.
Spells: Beginning at 1st level, a demonologist gains the ability to cast a small number of arcane spells. To cast a spell, the demonologist must have a Charisma score of at least 10 + the spell's level, so a demonologist with a Charisma of 10 or lower cannot cast these spells. Demonologist bonus spells are based on Charisma, and saving throws against these spells have a DC of 10 + spell level + Charisma modifier. The demonologist's spell list appears below; a demonologist has access to any spell on the list and need not prepare those spells ahead of time, just like a sorcerer. A demonologist casts spells just as a sorcerer does.
|Level||BaseAttack Bonus||Saving Throws||Special||Spellcasting|
|1st||+0||+0||+0||+2||Demonology, Fiendish Companion||+1 level of existing spellcasting class.|
|2nd||+1||+0||+0||+3||Demonic Pact, Pandemonic Summoning||+1 level of existing spellcasting class.|
|3rd||+1||+1||+1||+3||Abyssal Magic||+1 level of existing spellcasting class.|
|4th||+2||+1||+1||+4||Legion of Demon, Price of Power||+1 level of existing spellcasting class.|
|5th||+2||+1||+1||+4||Improved Pandemonic Summoning, Useful Tool||+1 level of existing spellcasting class.|
|6th||+3||+2||+2||+5||Abyssal Wrath||+1 level of existing spellcasting class.|
|7th||+3||+2||+2||+5||Demonbind||+1 level of existing spellcasting class.|
|8th||+4||+2||+2||+6||Greater Pandemonic Summoning||+1 level of existing spellcasting class.|
Class Skills (4 + Int modifier per level)