The Archetypal Self-Care System is Donald Kalsched’s signature theoretical construct, elaborated across the full breadth of his 1996 monograph, designating an autonomous, daimonic agency within the deep psyche that mobilises when ordinary ego-defences fail in the face of overwhelming early trauma. Distinct from the object-relational notion of a ‘caretaker self,’ the construct is explicitly archetypal: the protective-persecutory dyad that constitutes the system draws its energy and imagery from the collective unconscious and operates at a transpersonal register, beyond the reach of personal history alone. The system’s signature paradox — that its defences, originally life-saving, become the primary obstacle to further growth — is Kalsched’s central clinical observation. One side of the dyad appears as guardian angel, fairy godmother, or soothing enchantress; the other, activated whenever genuine relatedness threatens to dissolve the encapsulated inner world, turns diabolical, attacking the ego and its vulnerable contents. The system’s mythology is charted through fairy-tale amplification: Rapunzel, Fitcher’s Bird, and Prince Lindworm all dramatise the seductive imprisonment it maintains. Kalsched explicitly sets this formulation against purely Freudian or Winnicottian frameworks, arguing that primitive defences at this level carry irreducibly archetypal — not merely introjective — weight. Transformation requires confronting the secret daimonic element and progressively strengthening an ego capable of bearing the numinous in both its light and dark dimensions.