Necromancy -

: The original purpose of necromancy was "sciomancy"—summoning shades to answer questions about the future.

At its core, necromancy centers on the belief that the dead retain agency and can act as mediators between the physical and spiritual realms. Necromancy

Historically, necromancy has been both a scholarly pursuit and a forbidden rite. A Necromancer's Manual of the Fifteenth Century (review) A Necromancer's Manual of the Fifteenth Century (review)

Necromancy, derived from the Greek nekros (corpse) and manteia (prophecy), is traditionally defined as the art of communicating with the deceased to gain hidden knowledge or foretell the future. While often dismissed as a "black art" associated with malevolent sorcery, modern practitioners and historians describe it more broadly as a spiritual practice involving ancestor veneration, graveyard work, and the building of collaborative relationships with the "local dead". Foundational Concepts Necromancy