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This is a list of books with powers that have been mentioned and/or encountered in the podcast. It is not yet known how many of these books exist in the world, although Jurgen Leitner mentioned having 978 in his library at its height. (MAG 80)

They are often referred to by characters as "Leitners" whether or not they were actually in his library. It is unclear if they were referred to as something else before him, or if they were thought of as "each one a thing unto itself" (MAG 62). Robert Smirke calls them "secret" books (MAG 138).

In general, the books are more powerful than any other supernatural artefacts, though individual books may range from "innocuous" to "unsettling" to "murderous". Leitner refers to them as "the essences of The Entities in a purer form"; they generally only correspond to a single entity (with some exceptions such as the Key of Solomon). (MAG 80)

They frequently have unusual interactions with architecture that was either designed by Robert Smirke or based on his principles of balance. It seems to stabilize their effects to a degree and allows for safer storage. (MAG 80)

Some of the books can be destroyed by means such as burning (MAG 4) while others resist attempts at destruction (MAG 70). Leitner hypothesized that some (likely those affiliated with The Desolation) would like the flames, and upon burning would be "released to take a different form" (MAG 80). Jonathan Sims similarly theorized that attempting to rip a book of The Slaughter in half may have intensified its effects. (MAG 125)

Jon also mentions that "all" of the books from the library are custom editions of known texts on dæmonology or the arcane in MAG 4, though this has not borne out in canon even with books that would have been known to him and the Institute at that time such as Dig.

Books Edit

Title/Description Author Language Library of

Jurgen Leitner?

Effect Notes Last seen Affiliated Power Episode (bold if central focus) Version of an existing book?
A Disappearance Unknown English Yes Temporary Invisibility if a few words are read, complete disapearance without a trace if read from cover to cover. - In the possession of Leitner at his time of death Unknown mentions in MAG 66, MAG 80
A Guest For Mr. Spider Unknown English Yes Upon completed reading, causes one to walk up to some existing door and knock twice, upon which  they are dragged inside and presumably eaten by Mr. Spider. Bournemouth, UK, in the possession of unnamed childhood bully of Jonathan Sims (victim of book) circa 1995/6 The Web MAG 81
A Journal of the Plague Year Daniel Defoe English Yes Unknown, can involve reader's house becoming infected and collapsing Was at one point owned by Michael Crew Jurgen Leitner's library at time of its destruction The Corruption mentions in MAG 80, MAG 91 A Journal of the Plague Year
An Introduction to Higher Anatomy Unknown Unknown (presumably English) Yes Unknown Part of the "Yousuf case", which lead to Daisy Tonner and Basira Hussein being familiar with Leitner by name. - Unknown mention in MAG 92
Book of the Dead Various Various No Fills in the date of and details for the death of the reader, always gruesome and will move the date closer if the reader keeps checking his or her page. - Owned by Masato Murray, 2003 The End MAG 70
Dig Unknown English Yes Dig DIG Last known owner was Enrique MacMillan in November 2003. Currently held in Artefact Storage in a welded-shut box. Dig. DIG MAG 88: Dig
Ex Altiora Unknown Latin Yes Feelings of vertigo, post MAG 46 smell of ozone Used by Michael Crew to bind the Lichtenberg-figure creature stalking him (MAG 46/MAG 91) Destroyed by Gerard Keay in 2012 The Vast (inherently)

The Spiral (via creature trapped within)

MAG 4, MAG 46, MAG 91

Skin book Written in by users mostly Sanskrit, at least some pages in English No Used to bind a dead person's soul/spirit and allow them to be conversed with by the living Owned for a long time by Mary Keay, who at one point bound herself to it in an attempt to transcend death In the possession of Trevor Herbert and Julia Montauk The End MAG 62, MAG 111, mention in MAG 107
Small book bound in red Unknown Unknown Connected in some way to the Lightless Flame/Asag. Exact effect unknown. - In the possession of Diego Molina, December 2011. The Desolation mentions in MAG 12MAG 43
The Boneturner's Tale Unknown English Yes Grants reader bone control powers - In the possession of Jared Hopworth in 1996 The Flesh MAG 17, mention in MAG 91 The Cantebury Tales
The Key of Solomon 1863 Unknown English Yes Unknown. Previously owned by MacGregor Mathews. Purchased on ebay by Gertrude Robinson in 2007.

One recovered section reads: “They have for adversaries the Satariel, or concealers, the Demons of absurdity, of

intellectual inertia, and of Mystery.”

Burned by Jurgen Leitner, 2015. Contains "elements of several different powers". mentions in MAG 4MAG 66, MAG 70, MAG 80 Key of Solomon
The Seven Lamps of Architecture John Ruskin English Yes The book gives a sense of walls pressing in around the reader, and may physically entomb them. It interacts differently with Robert Smirke's architecture. Reading it while in a building designed by Smirke allows the reader to control its architecture. - In the possession of Leitner at his time of death The Buried mentions in MAG 66MAG 80

The Seven Lamps of Architecture  

Supernatural version published in 1845, while real version not even begun to be written until 1846

The Stalwart Hunters' Almanac Unknown English Yes Mutilation of reader corresponding to passages read - - The Hunt mention in MAG 80
The Tale of a Field Hospital Sir Frederick Treves English Yes Paper cuts cause death via putrefaction much more rapid than normal Connected to John Amherst. Presumably burned by Gertrude at the Magnus Institute after submitted with statement in 2003 The Corruption MAG 68 The Tale of a Field Hospital
Sanskrit poetry book about dead animals Unknown Sanskrit Yes Small animal bones fall from its pages. "Quite unremarkable" according to Mary Keay. Sold by Mary Keay to Jurgen Leitner but returned to her after the library attack when stolen from under Reform Club by Gerard Keay in 2002. November 2012, in the possession of Mary Keay at Pinhole books. Unknown mentions in MAG 4, MAG 35, MAG 62
Dictionnaire Infernal Jacques de Plancy Unknown Unknown. Sought after by Michael Crew in 1998 ("the older the better") and a copy purchased from Lion Street Books.  Owned by Michael Crew, 1998. Unknown mention in MAG 46 Dictionnaire Infernal
Small grey book Unknown Unknown, possibly Cyrillic script Unknown. Described as "trying to read [its reader] back". - Buried in a stretch of moorland by Michael Crew Unknown mention in MAG 46
クモが食べている (kumo ga tabete iru), translated as "Spiders Are Eating" Unknown presumably Japanese Yes - A movie may or may not have existed based upon it. (Unconfirmed if title and language of book match this movie) Destroyed by Alexia Crawley The Web MAG 110
unknown Slaughter book Unknown Unknown Unknown Causes people (potentially a whole community) to brutally kill each other After the carnage, was found ripped in half with its pages now blank. Is speculated that the tearing may or may not have intensified the release of its power. Torn in half in

Lanncraig, Ross-shire, Scotland; presumed to now be inert due to the blank pages

The Slaughter MAG 125
"Memory Book" Written in by users Unknown Unknown Sasha James at one point had to experiment with writing in it during her time as a practical researcher. Magnus Institute artefact storage Unknown mention in MAG 39
book that eats you Unknown Unknown Yes book that eats you (may leave behind a leg) Ate Leitner Library assistant Warren (inciting then-fellow-assistant Mikaele Salesa to start looking to leave) Leitner library (at some point before destruction) likely The Flesh mention in MAG 115
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