Lower-Order Spirits and the Ancestral Dead
In the underworld dwelt the spirits of the dead, who could affect the living, along with a range of other devils, potentially troublesome. Gods were treated respectfully at all times, but lower-order spirits and the ancestral dead could be cajoled, mistreated and forced into acts through binding oaths or attacks on their effigies…. Spoken or written spells produced powerful effects.
— Magic: A History, p. 83
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