|<small>[[Acolytum]] - Lexicanium - — [[Codicier]] - — [[Epistolary]] - — [[Chief Librarian]]</small>

'''Lexicanium''' is the lowest rank of [[Space Marine]] [[Librarian]]. This rank is given to those who have recently joined the [[Librarius (Fortress-monastery)|Librarius]] and are given duties related to the creation of battle reports to submit to the Chapter's records.{{Fn|1}}{{Fn|2}} These summary accounts chronicle the history of a [[Chapter]] and can vary in nature, depending on the Lexicanium's beliefs and philosophy or the campaign.{{Fn|2}}

Lexicaniums Lexicania are often distinguished by their lack of a [[psychic hood]] or even helmet, appearing very similar to their brother-marines except for the blue [[Power Armour]] that Librarians wear.{{Fn|3}}