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Catalogue Book
Catalogue Book (目録本, Mokuroku hon) is a magical artifact that has been in possession of Arthur's family for over 400 years untilit finally came into Arthur's possession. It has been refered to as a Human version of Star Memory. It is rumoured that alongside Arthur's, there are only two more such artifacts, one of the owners being unknown. The book is said to be able to contain and store celestial spirit gate keys and allow only the rightful owner to summon it, either via Requip or by flipping throgh the pages, as the two (Requip and the book) are connected, sharing the same miniature dimension, as the book, upon being opened for the first time, remembers the owner's magical trait.

The Catalogue Book is very large, about the size of a dictionary or encyclopedia volume. It is bound in brown leather, and the front cover has a symbol composed of an interlocking triquetra and circle on it, symbolizing the past, present and future owners of the book. Despite being four hundred years old, the book is actually in very good condition, thanks to a protective spell casted on it. The book's pages are written in ink by hand. Each entry has their titles spelled out in elaborate multicolored calligraphy. The book is written by the whole Moshiyoto line, throughout the generations, and possibly by also very close friends. The book contains many illustrations, particularly drawings of celestial spirits so that they can be recognized by those who have access to the book.Some of the spells within it are written in an old, possibly forgotten language. Arthur is currently working on deciphering them.

The book's organization is haphazard at best. Arthur has remarked on several occasions that he searched "the entire book" when looking for specific information, which suggests that the book's previous owners simply filled in the pages sequentially rather than arranging the contents topically. However, given that the Catalogue Book is a collaborative work with contributions by over four centuries worth of numerous celestial spirit mages, topical organization was likely a practical impossibility.

However, even though poorly organized, one could say that the book is divided into three parts. The first part of the book is regarding theoretical knowledge and the mechanics of said magic, focusing on rather explaining the magic and learning every aspect of it. The second part of the book focuses on spells, power-ups and techniques limited to celestial spirit mages, as well as numerous tips on training, intending on making a celestial spirit mage powerful enough for them not to rely on their spirits. The third and final part revolves aroundthe celestial spirits in general, most of which are randomly arranged. Each one of the spirits has their own entry in the book, as well as a drawing of both, the spirit and the key, as well as a listing of their abilities, advantages, previous owners, personalities, weapons and such.
 * Protection of the Stars (星の保護, Hoshi no hogo; lit. The Ultimate Protection of the Night Sky): The book's only protection mechanism against evil, a very special and unique defensive technique the book possesses; This spells seems to allow it to become invincible, figuratively speaking. By combining two defensive abilities, Celestia and Sideris, the book creates two goldens spheres orbiting around itself. As the two make contact, they combine in a single seemingly larger barrier. The said barrier can withstand both magical and physical assaults, serving as an ultimate defence. The book draws energy for this spell from the celestial spirit world and is activated when the book is either being attacked or stolen, preventing the two from happening.