Submister denoted a specific position within the criminal organization known as the Razzi Syndicate. When the book that would later be called the Smuggler's Guide fell into the syndicate's hands, the Adarian Twirm held the role of submister, reporting directly to the syndicate's leader, Latts Razzi. Razzi interrogated Twirm, seeking information about the book's origin and authenticity; the submister then explained the circumstances surrounding the syndicate's acquisition of the book. Razzi rebuked Twirm, dismissing the information as irrelevant and expressing her desire to know the book's history. After Twirm dared to offer Razzi advice on managing the syndicate, she ordered his execution, lamenting the difficulty of finding competent individuals for her operations.
The term "Submister" initially appeared in the 2018 reference publication Star Wars: Smuggler's Guide, authored by Daniel Wallace.