Changes

A '''Librarium''' or '''Librarius''' is the command and communications center centre of a [[Space Marine Chapter]]'s [[fortress-monastery]], and the repository for centuries of wisdom and history, culled from the reports, treatises and memoirs of the chapter's greatest warriors and finest minds.

Most of the servants who work in the Librarium are [[psyker]]s - those who are full [[battle-brother]]s of the chapter are known as [[Librarian]]s. Librarians hold a functionary rank, describing their role as well as their position. The four battlefield ranks of Librarian, in ascending order of importance, are [[Lexicanium]], [[Codicier]], [[Epistolary]] and [[Chief Librarian]]. Each of these enters battle ready to support his brothers with a range of psychic attacks and defences.

In the deepest bowels of a Librarius lay lie the Chapter archives, where many forbidden and dangerous secrets and lore often are kept.{{Fn|3}} Within certain chapter fortresses, the Librarium serves as the control center centre for the base's defence systems.{{Fn|1}}