Tome Of Eldritch Lore
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Basic Information

The Tome of Eldritch Lore is a horror trope. The tome is a book which contains forbidden and dark knowledge which is likely to drive the reader insane and cause all sorts of other detrimental side effects as well - even if no one is actively reading it in some cases.

The ur-example is probably H. P. Lovecraft's Necronomicon - although the idea of the grimoire is far older. Lovecraft's creation was specifically of the "repository of things Man was not meant to know", but other examples could well include books of spells and lists of demon names. Indeed, even without Lovecraft's context, the direct translation of Necronomicon as "book of the names of the dead" suggests that it might be a useful tool of necromancy.

More fantastical examples can turn out to be the laboratory notebooks of one or more wizards, know for their groundbreaking research. Even if these wizards were positively reputed, such knowledge - especially where "experimental write-ups" are incomplete or fail to mention (or explain) the "standard safety precautions", this can still be dangerous. The edgier the wizard, the dodgier the research. Also, expect such things to be far from clear - in environments without IP law and/or where people are worried about their work being stolen and/or misused - expect a great deal of allusion, metaphor and outright encoding.

"Whiter" versions of this book may be, effectively, magical textbooks - explanatory texts setting forth points of thaumatology for the benefit of students. The context in which such a thing would be written bears careful consideration1.

The fantasy RPG market has tended to cheapen these things somewhat due to the high prevalence of the spellbook in many systems and settings - although even these can have works that can stand up alongside their fictional and legendary peers. The Book of Vile Darkness and similar works from the Dungeons and Dragons metaverse would be good examples of the type2.

Real world books belonging to this category include: Romanus-Buchlein, Egyptian Secrets of Albertus Magnus, The Sixth and Seventh Books of Moses, The Lesser Key of Solomon, Petit Albert and Powwows, or "the long lost friend". The Ancient Egyptian Book of the Dead was an interesting variation on the theme, being essentially a selection of "cheat codes" provided to a deceased soul amongst its grave goods to allow it to better overcome the various trials awaiting on the way into the afterlife. Many more exist.

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Game and Story Use

  • Mandatory for Cosmic Horror campaigns.
  • In settings where invocation - and outright summon magic - are popular, the names of spirits and demons, used as part of summoning and binding rituals, are prone to be a significant currency amongst users. Obviously, such knowledge is unlikely to be published, but each worker might keep their own registry - probably including any other information on the entities in question, records of successful (and unsuccessful) summonings and, if applicable, notes on preferred payments and bargains. Such a registry that comprised a lifetime's records from someone known to have controlled a great many spirits might be a significant prize.
  • Cost/benefit for use of these things should depend upon setting - horrific secrets about the true nature of reality may be more harmful (and less use) than a demon summoner's journal (although in a wainscot fantasy setting, such a thing might be unnerving even if the reader didn't actually believe in the supernatural.
  • Important to consider who wrote the book and why - the darker the magic involved, the more likely it is that the book was written with ill intent; it would be entirely normal for the sort of person that practices left hand path magic to leave behind a record that is deliberately misleading or dangerous so as to cut down on "the competition" (even to the extent of tampering with other people's previously safe work. Alternatively, a given book of magic might turn out to be the thaumatological equivalent of The Anarchist's Cookbook - a collection of deliberately dangerous techniques propagated by what might loosely be considered law enforcement to eliminate (or at least scare off) would be troublemakers.
    • In the Dresdenverse the wardens of the White Council (essentially the magic police) are known to distribute ill intentioned magical rituals as widely as they can - in universe such rituals call on a specific, fixed source of power so the more people who try to use it, the less chance there is of any one of them getting enough energy from it to achieve anything.
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