Demon

Demons are powerful, often malevolent spirits that revel in pain, chaos, and death. They are created from human souls that have been corrupted and stripped of their humanity.

Appearance
In their true form, demons come in all forms, from the almost-human to the monstrously grotesque, depending on their level of spiritual decay.

However, while possessing a human, they are indistinguishable from ordinary humans, save for black eyes, pronounced black veins, sharply pointed teeth, and clawed fingers, which can be revealed at will or under direct sunlight.

Abilities
Demons can have varying powers, but are generally shown to possess supernatural strength, endurance, and healing, in addition to their innate ability to grant wishes in the context of a deal.

Behavior
While most demons have free will, when bound, they cannot disobey direct orders from their master. At their core, most demons seem to be sociopathic, manipulative creatures, living solely to feed on, corrupt, and tempt humans. Most demons forget what it means to be human, while some have even forgotten that they were once human.

Diet
Despite no longer requiring food, water, or sleep, demons often consume food and alcohol while inhabiting a human. Most demons have also develop an appetite for human flesh or blood.

Transformation
Humans can become demons by either having their soul consumed by a demon, by drinking demon blood, or having their souls corrupted. Demons can be born through the normal procreation, whether with another demon or with a human, but many demons are souls that have shown sufficient 'promise' and have been subsequently corrupted into true demons.

Types of Demons
Several types of demons exist.
 * Ravagers
 * Succubi
 * Skinwalkers

Weaknesses
Almost all demons share the same vulnerabilities, with a few exceptions.
 * Exorcism: Demons could be exorcised and banished from existence entirely.
 * Free Will: Demons cannot deny humans their free will. However, they can tempt them with deals.
 * Magic: Powerful witches can use magic to summon, control, imprison, or banish demons.
 * Silver Poisoning: Due to its inherent mystical purity, demons are violently allergic to silver. Direct physical contact with silver, in the form of a metal weapon or even a fine chemical mist, causes damage similar to a chemical burn, while just being in the presence of great amounts of silver, causes extreme weakness and severe feverishness, often to the point of unconsciousness. If merely injured by a silver object, the injury will leave permanent scars, but if it is completely absorbed into the bloodstream or if silver pierces the heart, their body will burst into flames and be reduced to charred remains.
 * Theology: Theological weapons that represent the divine, such as idols, seals, talismans, holy water, crucifixes, and even prayers can ward off and harm lesser demons, but only if the wielder has genuine faith.
 * Willpower: Humans of considerable willpower can resist demonic influence and possession.