Grimoire

are magical books recording spells and Thaumaturgical Systems. They are similar in function to Magic Crests.Mahoutsukai no Yoru - Chapter 12: "Witch on the Holy Night II"
==Principles==
To a magus, deciphering a Grimoire is not just a matter of comprehension, but for recreating a Mystery from eras past, and then redefining its meaning in the current era, like translating Shakespeare into modern English. It's not just "deciphering a certain Grimoire", but "deciphering a Thaumaturgical System". A magus must digest all concepts and comprehend all the interrelated phenomena.Clock Tower 2015 - 02 The Record of Lev Uvall
If deciphering a page of a Grimoire takes an hour, then a 500-page tome takes some 20 days.
==Role==
===Fate/Zero===
Prelati Spellbook front.png|Prelati's Spellbook after being cut by Gáe Dearg.
Rin and the grimoire.gif|Child Rin attacked by a Grimoire.
During the Fourth Fuyuki Holy Grail War, the Caster Servant Gilles de Rais's Noble Phantasm, Prelati's Spellbook, was a Grimoire.Fate/Zero Volume 2: The Mad Feast of Kings - Act 7 Part 2 -130:32:40 
Prelati's Spellbook allows the summoning of an army of water demons from the depths of the seas of another dimension, as well as , and , regardless of the user's skill in magecraft in relation to the use of the Grimoire.Fate/Zero Volume 2: The Mad Feast of Kings - Act 8 Part 3 -106:08:19Fate/Grand Order material I - Gilles de Rais (Caster), p.288-293 But beyond being a tome of spells and Curses, the book itself is a "monster" that functions as a core possessing its own enormous magical energy furnaces completely independent of its wielder's magical energy.
In the anime adaptation, while looking around her father's Magical Workshop, Rin Tohsaka opens a Grimoire which, speaking in German, tries to take off her hands.Fate/Zero Anime - Episode 10: "Rin's Adventure"
After the Fourth Fuyuki Holy Grail War ended, Waver Velvet, now known as Lord El-Melloi II, looking for ways to cure his disciple Gray of her condition, gathered and consolidated all the theories and research left behind by his predecessor Kayneth El-Melloi Archibald into a Grimoire entitled “Lord Kayneth’s Encyclopedia of Secret Arts.”
===Clock Tower 2015===
Lev Uvall's role in the Department of Archaeology is to read and decipher the 500 Grimoires in the research lab of the department.
===Fate/Samurai Remnant===
Crimson Codex is a sentient talking Western Grimoire that was left as an heirloom to Miyamoto Iori by Miyamoto Musashi. It assists him during the Waxing Moon Ritual by teaching him magecraft.
===Fate/Grand Order===
In Fate/Grand Order, appear as enemies, introduced in the Fourth Singularity, Fate/Accel Zero Order event and Shinjuku Subcategory Singularity. Their Saint Graph Designation is Caster.
In the Salem Subcategory Singularity, the Whateley family's Grimoire, the Book of Eibon, contains heretical spells and tales of heretical Gods.Fate/Grand Order: Epic of Remnant - Salem: The Forbidden Advent Garden - Section 5: Fourth Knot Similar to several other Grimoires such as the , it talks of the Outer God Yog-Sothoth.Fate/Grand Order: Epic of Remnant - Salem: The Forbidden Advent Garden - Section 7: Sixth Knot
====Abilities====
=====Skills=====
*
=====Noble Phantasm=====
The Grimoire's Noble Phantasm is .
==References==
vi:Ma Đạo Thư‎
Category:Magecraft terminology
Category:Terminology in Fate/Grand Order
Category:Characters in Fate/Grand Order (Part 1)
Category:Magical books
Category:Terminology in Fate/Zero
Category:Terminology in Fate/Samurai Remnant
Category:Terminology in Lord El-Melloi II
Category:Terminology in Mahoutsukai no Yoru