demono-, demon-, -demonic, -demon, -demonical, -demoniac, daemono-, -daemonic, -daemonical, -daemon, -daemoniac, -daemonia, -daemoniacally, -daimon, -daimonic +

(Greek: devil, demon [evil spirit]; an intermediary spirit between gods and men which could be good or evil)

demonologist
Someone who writes about, or is versed in, demonology.
demonology
1. The study of demons; especially, those that are frequent in the folklore of some societies.
2. The written presentations of demons or of beliefs about demons.
demonomachy (s) (noun), demonomachies (pl)
Fighting with a demon or demons.
demonomancy
Divination by calling on demons for prophecies as in black magic.
demonomania
1. A form of madness in which the patient conceives himself possessed of devils.
2. A morbid dread by a person who believes he/she is possessed by demons.
demonopathy
A mental disease in which the patient fancies himself/herself, or acts as if, he/she is possessed by a demon.
demonurgy
The practice of magic with the help of demons.
eudemon
1. A supposed benevolent supernatural being.
2. A good, or benevolent, demon or spirit.
eudemonia, eudaimonia, eudaemonia
1. Aristotelianism or happiness as the result of an active life governed by reason.
2. A state of pleasant well-being.
3. The greatest good for an individual human being or a state of excellence characterized by objective flourishing across a lifetime, and brought about through the exercise of moral virtue, practical wisdom, and rationality.
eudemonism
1. An ethical system that evaluates actions by reference to personal well-being through a life based on reason.
2. An ethical doctrine that characterizes the value of life in terms of happiness.
eudemonist, eudaemonist
Someone who believes, and practices, the doctrine that the basis of moral obligations is to be found in the tendency of right actions to produce happiness.
eudemonistic
1. A reference to a classical Greek word commonly translated as "happiness">
2. Etymologically, it consists of the word eu, "good" or "well being" plus daimōn, "spirit" or "minor deity".

It is used by extension to mean one's lot or fortune. Although popular usage of the term happiness refers to a state of mind, related to joy or pleasure, eudaimonia rarely has such connotations, and the less subjective "human flourishing" is often preferred as a translation.

pandemonism
1. The belief that every object (animate or inanimate), idea (abstract or concrete), and action is inhabited by its own independent supernatural spirit; and the worship of such spirits.
2. A belief in a universe that is infused with an evil spirit.
3. The worship of spirits dwelling in all forms of nature.
polydaemonism, polydemonism
1. A belief that there are many demons.
2. The worship of a multitude of demons or of demoniacal powers.
polydaemonistic
A reference to a belief in many evil spirits.