Rise of the Flayers
If someone you love falls ill to a burning fever, vivid hallucinations, dry skin, lip and hand deformities, and are constantly rambling about “The voices”, kill them or leave them in the wild to die. They are experiencing the “Demon Plague” (as it is commonly known) and will either turn into a monster so evil it will kill you to eat your brain, or will die from this disease.
This disease is a strange one that causes the lips of humans to split and elongate, looking like tentacles, and their fourth finger to shrivel up into nothing. They hallucinate as their brains are re-wired and complain about voices due to expanding telepathic ability. Their skin dries out in the beginning, but if it starts to look better, the transformation is nearly complete. They become Demi-Illithids, the first stage in Illithid evolution, which are not nearly as powerful as Illithids, but are made in a different way, and are thus more frightening. This disease generally only affects humans, but sometimes will harm those of other races. Non-humans who are affected by this disease experience the same symptooms and transformations, but usually die before they are finished. Those that don’t are enemies to be feared. Unlike the normal reproduction process, Demi-Illithids remember who they were and what they stood for. They just have a new perspective to match their new form.