I'm nearing the end of The Magnus Archives season 3 now!

I heard recurring character Gerard Key explain his backstory and the supernatural paradigm the show operates upon (statement taken posthumously direct from subject), a true-crime club who started hunting each other, what appears to be a different vampire depiction, a cleaner who appears to have accidentally traversed universes (via a recurring haunted house) to reach the Magnus Archives, an antique meat grinder, & The Mechanical Turk.