The term ‘chthonic’ names one of the most structurally generative tensions in the depth-psychological corpus: the opposition between underworld powers rooted in earth and the dead, and the Olympian or spiritual principles elevated above them. Across this library, the chthonic operates simultaneously as a cosmological category, a psychological metaphor, and a ritual designation. Rohde grounds the term in Greek cult practice, tracing its application to deities of fructification and death alike, insisting that chthonic powers cannot be reduced to mere destruction. Burkert systematizes this ambivalence, showing how Zeus, Hermes, Hecate, and Dionysos each receive the chthonic epithet, exposing the term as a theological marker of underworld adjacency rather than simple negativity. Jung transforms it into a depth-psychological category: the chthonic spirit is, for him, the dark face of the divine, the animating ground of sexuality and instinct that alchemy attempted to redeem. Neumann situates it in the hero’s developmental struggle, where the phallic-chthonic must be integrated with spiritual masculinity. Hillman reframes the chthonic underworld as the proper home of dream images and soul — not a lower register of life, but an ontological domain in its own right. The term thus carries a productive double valence throughout: it names both a dangerous, devouring darkness and a generative, fructifying depth indispensable to psychic wholeness.