Not to be confused with Ghuls.
Ghosts are beings who reside in the spirit world and have the tendency to visit Earth. Places such as Bannerman's Island were known for their ghost populations. When Iblis absorbed the energy of the spirit world, nearly all the ghosts were destroyed. However, new ghosts are constantly being formed. Magical items, such as talking boards allow the user to contact ghosts, which was how John was able to contact Manco Capac.