People can rarely be born with high spiritual energy, which can allow them to become Exorcists or Mediums. Exorcists aim to get rid of all spirits. Mediums simply wish to interact with spirits, for one reason or another. There are three different types of spirits. Wraiths are spirits of people full of malice when they died, and are powerful, yet not very smart. Souls are spirits of people who found inner peace in life. Ghosts are spirits that don't fit in. Normal people cannot see spirits.