Although *barely* literate, Rustok was intensely proud of his book, having never had one before and considering himself too dull witted to ever be afforded the privilege.
Remus (Galen Lovage) and Zarina Zenyatta painstakingly taught the lumbering oaf his letters on the request of Constantine Callius, who believed that his squire should be educated and informed in order to best represent himself and the House Callius. Rustoks attachment to his journal was significant enough that Valtorix was able to use it as an arcane anchor to restore the memories of Zarina, Constantine and Rustok after they were returned to their own time from the island of Terntolgalan.