Speak with dead
The corpse being subjected to this "reading" had to be intact enough to speak and the questions asked had to be in a language that the deceased understood.The corpse also had to have been of an intelligent creature in life.
The more complete the corpse, the more complete the answers. The knowledge stored in the corpse after death was only that which the deceased knew in life. Answers were usually short, truthful, and cryptic, like a riddle. More experienced priests could ask more questions for a longer period of time. For the older version of speak with dead, the longer the person had been dead, the higher the level of priest was needed to cast the spell. For the ritual version, a maximum of three questions could be asked, depending on the skill with which the caster conducted the ritual.
If the deceased was of a different alignment to the questioner, the imprint of the deceased on the corpse could resist speak with dead and negate the spell. This spell also failed if the corpse was undead or if the same corpse had been questioned within the past week. In Kara-Tur, wu jen who cast this spell risked angering the dead, who would hold a grudge against the caster for disturbing them.