While there have been several notable cases of departed souls communicating with magically attuned men and women, most spirits lack the ability to talk to the living. With this spell, however, you can speak to any spirit you come across. Simply bear in mind that it is most assuredly not a spell to be used for mischief. The spirit world is full of evil souls that will gleefully punish such wayward wizards.
Spirit Medium is an everyday spell that allows the caster to speak to the spirits of the departed -- both good and evil. This spell given to Oliver by the spirit Horace when they first meet in Ding Dong Dell.