Within the depth-psychological corpus, the Troll figures as one of the most sustained and symbolically weighted embodiments of primitive spiritual possession — a force that drains human vitality, severs relatedness, and petrifies living culture into inorganic stasis. Marie-Louise von Franz is the dominant voice, treating the Troll not as a mere folkloric monster but as a psychic complex of the first order: an archaic nature-spirit that, when it overwhelms the ego, dehumanizes entire collectivities and suspends the capacity for warmth, affect, and human connection. Von Franz reads the Troll’s bloodlessness — and his habit of absorbing his victims’ blood — as a precise mythological image of fanatical possession, wherein ideological or spiritual inflation evacuates normal human feeling. The Troll also appears as the suppressed pagan substrate beneath Scandinavian Christianity, a counterpart to the black wizard in Mediterranean psychology, and as the negative animus of a woman utterly in thrall to an underworldly quasi-divine principle. Jung’s index entry — troll or ‘treader’ — anchors the term etymologically without elaborating its psychological valence. Across the corpus, the Troll’s destruction is never merely heroic: his blood, rightly returned, redeems the kingdoms he has frozen. The term thus marks both the problem of primitive spiritual inflation and its paradoxical cure: the very power that petrifies contains, within itself, the substance of redemption.