Demon

Demons are a race of magical beings motivated by Evil. They seek out to kill innocents and the forces of Good. Demons are unable to feel emotions and possess no soul or conscience. Almost all demons are immortal, and in some occasions, however, a demon can become good and desire to live a mortal life.

For centuries they have been ruled by the Source of All Evil, who claimed to be the most powerful of all demons. Most demons live in the Underworld or the mortal world, depending on what goal they wish to achieve or how they influence the mortal world. When exiled, a demon is not allowed to live in or enter the Underworld which is punishable by death.

Demons are said to come in every shape and form. And while that is true, most demons seem to have a human appearance, either by nature or with magical help. It is also possible for demon to have an amorphous body instead of physical form.

Low-level demons are easily vanquishable with powers, a basic potion, or a spell. Upper-level demons require Power of Three spells and potions.

Demonic Hierarchy
There is a hierarchy set out in the Underworld that defines the rank of all demonkind and those evils who are beneath them. Depending on the hierarchy, demons are usually classified into two groups: lower-level and upper-level.

At the top of the demonic hierarchy are the upper-level demons and those who rule the Underworld. At the bottom are those demons who were banished from the Underworld and thus live in exile and warlocks.

Book of Shadows
The Halliwell Book of Shadows contains specific entries on countless demons, often telling them what these demons wish to achieve and how they can be vanquished. Demons who do not have an entry in the Book of Shadows are usually low-level and too insignificant to mention. Besides these entries, the Book of Shadows contains a general entry on demons as well. Demons
 * Observations upon the
 * Nature, the Number, and the
 * Operations of the Devils.

Notes and Trivia

 * Humans can be converted to demons (through a special academy) and vice versa (with the help of a sorcerer or the Elders).
 * The Siren was turned into a demon as she was being consumed by hatred when she was burned at the stake.
 * Some demons can convert unwilling humans into demons, such as Wendigos, Banshees, and Furies. Usually the conversion can be reversed if certain conditions are met, though the window of opportunity to reverse the change seems to remain open so long as the human-turned-demon hasn't killed anyone during their transformation.