The description of Zannah's attack on Set Harth:
"Sith sorcery was as much a part of the dark side as the deadly violet bolts of energy her Master unleashed from his hands, and when Bane had first recognized her talent for the subtle but devastating magics he had encouraged her studies into the arcane. From ancient texts she had learned to twist and torment the thoughts of her enemies. She could make them see nightmares as reality; she could cause their deepest fears to manifest as demons of the psyche. She could, and had, rip the minds of her enemies apart with a simple thought and a gesture.
With Set, however, she did not intend to destroy him completely. Instead she enveloped him in a cloud of utter despair and hopelessness. She reached into the innermost recesses of his mind and wrapped it in the nothingness of the void."
It isn't just primal fears. Though I doubt the HoT lacks those.