An idea I had just now so no idea of how feasible it would be but!: on the Darkness Personae, maybe more plots involving that potential line of mimicry? I'm thinking along the lines of Darkness Personae being something along the lines of Slenderman, who is without any real identity and comes from an ill-defined (and unconstrained) mythos; though any sort of creepypasta could maybe be used since so much of creepypasta is built through memetic power in a way that could be fitting for a Darkness' attempt at mimicking a story.