Rituals
Rituals, such as these, were common practices associated with necromancy, and varied from the mundane to the more grotesque. Rituals in necromancy involved magic circles, wands, talismans, bells, and incantations. Also, the necromancer would surround himself with morbid aspects of death, which often included wearing the deceased's clothing, consumption of unsalted, unleavened black bread and unfermented grape juice, which symbolized decay and lifelessness.
Rituals, such as these, could carry on for hours, days, even weeks leading up the summoning of spirits. Often these practices took part in graveyards or in other melancholy venues that suited specific guidelines of the necromancer. Additionally, necromancers preferred summoning the recently departed, citing that their revelations were spoken more clearly; this timeframe usually consisted of 12 months following the death of the body.Once this time period lapsed, necromancers would summon the deceased’s ghostly spirit to appear instead.
Although some cultures may have considered the knowledge of the dead to be unlimited, to the ancient Greeks and Romans, there is an indication that individual shades knew only certain things. The apparent value of their counsel may have been a result of things they had known in life, or of knowledge they acquired after death: Ovid writes of a marketplace in the underworld, where the dead could exchange news and gossip.