Primal Man was assigned the task of defending the world of Light against the aggressor, the world of Darkness. So Primal Man went out to do battle with the world of Darkness, but in the battle he was defeated. Or, by other accounts, the defeat was a voluntary one
Edinger presents the Primal Man as the central agent of the Manichaean cosmogonic drama — a divine figure whose voluntary self-sacrifice to Darkness enables the eventual liberation of trapped Light-substance, rendering the myth a paradigm of redemptive suffering.
, The Mysterium Lectures: A Journey Through C.G. Jung’s Mysterium Coniunctionis, 1995thesis