You’re in luck, Pratt: Palamedes’ post-apocalyptic religious cult did cover souls as a food source!
“The emotions clearly play a part,” says Palamedes, gaze focusing on the middle distance as he thinks through the puzzle. “And those who were drawn into the nothingness last October speak of experiencing existential horror that, presumably, the ghosts live with all the time. The Captain could be feeding on that. Or,” he presses his lips into a thin line, “he could be feeding on the souls themselves. Even one can fuel extraordinary power, and he has hundreds of them, maybe thousands. Maybe once a passenger is no longer giving him what he wants via their emotions, he makes spectres of them, and derives his power from them that way."
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“The emotions clearly play a part,” says Palamedes, gaze focusing on the middle distance as he thinks through the puzzle. “And those who were drawn into the nothingness last October speak of experiencing existential horror that, presumably, the ghosts live with all the time. The Captain could be feeding on that. Or,” he presses his lips into a thin line, “he could be feeding on the souls themselves. Even one can fuel extraordinary power, and he has hundreds of them, maybe thousands. Maybe once a passenger is no longer giving him what he wants via their emotions, he makes spectres of them, and derives his power from them that way."