Spirit

Spirits are non-corporeal supernatural entities that usually reside in the Nevernever.

Description
Spirits generally dwell in the Nevernever, and are usually attached to a specific concept or force that defines both their personalities and powers. Spirits do not have free will as such, their True Names cannot change over time. They are often summoned by practitioners. (ref?)

Types of spirits

 * Demons
 * Genius loci
 * Ghosts

Known spirits

 * Bob
 * Demonreach
 * Parasite