Grimoire

Grimoires  (魔道書) refers to the devices of sorcery, usually in the form of books, containing knowledge about magic. In Trinity Seven, information about the Thema of a magician is recorded in grimoires to help them in their research.

There are some grimoires that doesn't have to be in the shape of a book: for example, Mira's grimoire, the Book of the Mirrored Lands, takes the form of a crystal ball, while the Headmaster's grimoire, Solomon's Gate, is, as its name indicates, a huge gate following him everywhere and cannot be seen unless you possess a certain amount of magic.

Currently, only Hijiri, and by extension Arata, have been shown to be powerful enough to have contracts with more than one of the legendary grimoires.

According to the headmaster, whenever one is fighting a magus of a higher level, equipping one's grimoire is indispensable.

Maris is the only Arbitrator who is a Grimoire in human form, which makes her unique to all Grimoires.