Note: The Council's motto is taken from Matthew 16:18
"In a corner of my soul there hides a tiny frightened child, who is frightened by a corner where there lingers something wild." ― Shaun Hick, The Army of Five Men
There are two techniques by which discarnate demons, pure or, more accurately, impure spirits, may obtain influence within the human realm. The first and more common technique, one I expect every student in this class is already familiar with, involves the possession of a human body by a demonic spirit, for example as in vampirism.
The second technique is known as domination. Unlike possession, in which a demon takes over a human host, domination entails the creation of a psychic bond between the demon and its host. The demon does not inhabit the host but is, instead, connected to the host's mind. Think of a boat tied to a dock. Like the boat, which remains in the sea, the demon continues to be discarnate, existing in a non-material plane, but a persistent connection between the demon and its human host remains. It may sound trivial. I assure you, it is not. The demon is, in effect, always in the back of the host's mind, whispering directly into the host's thoughts, always exerting its pernicious influence.
The greatest challenge of domination is detecting the presence of the discarnate demon. Unlike possession, domination does not create physical changes in the human host. There are no fangs or claws to reveal the demon's presence. Psychological changes are, however, inevitable under domination. The presence of a demon in the host's mind generates tremendous mental pressure. In every case of which we are aware, the human host has undergone a significant personality transformation. The effects are not dissimilar to psychological trauma. An ignorant host, one uninitiated in demon lore and hence unaware of what is occurring, may well end up in a mental institution. Such a situation, while serious, is not our worst-case scenario. Detecting domination becomes a true challenge when the host is cognizant of demon lore. In an astute host, one shrewd enough to avoid detection, domination allows the discarnate demon free-reign within the human realm.
The bond forged under domination, once created, cannot be broken. The human host is forever corrupted. Much like the host who embodies, say, a vampire, the human victim of domination cannot be saved.
- from Advanced Demonology 305, Watcher's Council Lecture Series