In Franz Bardon's Hermetic system—detailed in his book
The Practice of Magical Evocation—
evocation is the practice of calling a spiritual entity to manifest
outside the magician's own body and sphere of consciousness.
Key Elements of Bardon's Definition
Separation from the Magician: Unlike
invocation (which draws a spirit's energy or consciousness inside the practitioner's body or aura), evocation keeps the entity and the magician strictly separate. Communication happens through external dialogue rather than inner blending.
External Manifestation: The spirit is projected to appear in a designated, prepared physical or astral focus outside the magician—such as a magic mirror, a triangle of manifestation, a fluid condenser, or a specific atmospheric space.
Requirement of Developed Senses: Bardon emphasizes that outer ritual words alone are insufficient. The magician must first develop high-level clairvoyance (astral sight) and clairaudience (astral hearing) to properly perceive, hear, and interact with the evoked entity.
Hierarchy and Safety: Bardon's system maps out a structured hierarchy of beings—beginning with elemental beings (gnomes, undines, sylphs, salamanders) and moving through planetary and sphere intelligences—stressing that the practitioner must master the moral and energetic discipline of his first book (
Initiation into Hermetics) before attempting these external operations.