Lexicanums are Space Marine Librarians who arent seen in combat. Most of the time, they are at a Chapter's Librarium, storing the vast amounts of information the chapter has gathered over the years. With more training, they can become Codicers and be given significant combat assignments, able to harness their powers with greater clarity. Lexicanum Librarians are often distinguished by their lack of a Psychic hood and helmet, usually appearing very similar to their brother-marines except for the blue Power Armour that Librarians wear.
