Some articles on yidde:

Witchcraft And Divination In The Hebrew Bible
... being a yidde'oni yidde'oni literally means gainer of information from ghosts being a doresh el ha-metim doresh el ha-metim literally means (one who) questions corpses qasam qesem ... Classical Jewish sources argued that yidde'oni might be another form of ventriloquism, in which the voice is cast into at a bone which is placed into the ventriloquist's mouth ... for two of the three necromantic practices, namely Ba'al ob and Yidde'oni, while the Covenant Code of Exodus ascribes it for kashaph ...