Oliver is an omnipresent, benevolent, and immortal being who appearing to mock Allison and to distract her from saving the lives of her patients. His arrival is indicated by a demonic squeak that pierces space and time. He brings his friends that try to overtake you and your medical duties occasionally but that's no big deal.  Ruth is their designated feeder, but they dislike the small habitat she has provided and instead Oliver travels through the hospital and infects wounds with their bad hygiene.

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