The initiatory mystery stands at one of the most generative crossroads in the depth-psychological corpus, drawing together comparative religion, archetypal psychology, anthropology, and phenomenology of religion into a sustained meditation on transformation as the fundamental datum of psychic life. Eliade establishes the structural grammar: initiatory death as cosmogonic regression, the novice dissolved into primordial chaos so that a new self may be created ex nihilo. Burkert anchors this pattern historically in the Eleusinian and Bacchic mysteries, reading their ritual sequences — pig-sacrifice, veiling, kykeon, the Anaktoron’s fire — as the institutionalization of an older, perhaps puberty-derived, ordeal. Campbell universalizes the schema across Australian, Orphic, and Dionysian material, insisting that the mystery stages of descent, dismemberment, and epiphany are the heroic monomyth’s esoteric interior. Hillman, more sparely, identifies the Greek telete — mystery-rite as fulfillment — with the telos of individuation itself, arguing that the soul’s want is precisely initiatory completion. Corbin extends the problematic into Islamic and Christian gnosis, questioning whether revealed religion can sustain an initiatory dimension without contradiction. Harrison traces the social origins of mystery brotherhoods in shamanic and tribal initiation. The central tension across all positions is whether the initiatory mystery is best understood as a socially administered rite, an intrapsychic archetypal process, or an irreducibly religious encounter with the sacred.