Demon

A demon is a humanoid being created by witches.

Origins
Long ago, a witch discovered that she was able to create a demon by reviving the soul of a dead animal using her witches' energy. The method of creating demons was spread to other witches throughout history. Demons depend on witches' energy to maintain their spiritual container and stay alive, but when demons discovered that they were able to gather witches' energy by killing witches and maintain their containers themselves, they began to betray their creators and kill witches in order to gain independence. Thus a war between witches and demons began.

Characteristics and Abilities
Demons usually have several forms, a beast form and a human form, likely because they are born from dying animals. They are always male and will shift back into their animal form when sleeping.

Demons can summon ghouls, create their own spiritual container by swallowing the marble of a witch, and possess a witch's body (but it must be the witch that created them). Some demons can summon ghouls better than others.