'''Lexicanium''' is the lowest rank of [[Space Marine]] [[Librarian]]. This rank is given to those who have recently joined the [[Librarius]] and are given duties surrounding related to the creation of battle reports to submit to the Chapter's records.^{{Fn|1 ³ }}{{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.³ {{Fn|2}}

Lexicanium Librarians Lexicaniums 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.²{{Fn|3}}

*^{{Endn|1 }}: ''[[Genestealer (Game)|Genestealer]]'' (1990, ''Space Hulk'' expansion)*^{{Endn|2 [[Codex}}: Ultramarines (2nd Edition)]] - p81 (derived from Lexicanium models)*³ [[Index Astartes I]] - ''Psykana Librarius'' Space Marine Librarians*{{Endn|3}}: [[Codex: Ultramarines (2nd Edition)]], pg. 81