Book of Judgement
From Warhammer 40k - Lexicanum
The Book of Judgement is the revered tome of the Adeptus Arbites and the legal code of the Imperium. In theory it embodies every decree ever passed by the High Lords of Terra but as the millennia have passed the book grows ever heavier. It has spread beyond a single tome and parts of it are written on human flesh and in languages long forgotten by nameless functionaries.
Such is the Imperium that every day a hundred new volumes are added to the number of tomes and each sits upon an iron shelf which fills the Hall of Judgement. Legal assistants crawl among the many shelves of the room and often they have to rise to a hundred metres to reach a relevant tome.