Underworld

An Underworld is a type of world classification mentioned in Every Heart a Doorway. Eleanor says to Nancy that they're usually Nonsense worlds, though there are some exceptions. In the last chapter, Kade says to Nancy that he and Christopher and working on a new map for worlds connected to the dead, with Vitus and Mortis as minor directions.

Examples

 * Halls of the Dead
 * Mariposa
 * Unnamed Mirror World

Trivia

 * An Underworld is "the mythical abode of the dead, imagined as being under the earth."