Nonconventional lexical units have an important place in the regional novel. Regionalisms dominate among the elements of the marked vocabulary. However, the novel Cellule XIII by Jean Rogissart is considerably different from the works of writers-regionalists. In this study, we propose an analysis of the two following segments of an uncodified substrate: 1) local lexemes; 2) lexemes of a traditional argot. It is worth noting that the title of the article, which contains the word “fusion”, shows the importance of two language subsystems in the narrative: the insertion of territorially restricted units and argotisms into the fabric of an artistic text is necessary to identify the speaker and a more accurate description of events. The Ardennes author who devoted his novel to the theme of war, the main theme of the 10th International Conference on Argotology, managed not only to describe the physical and moral sufferings of the people, but also to engrave the characteristic features of their compatriots, and thus preserve the linguistic heritage. The study of the regional and argotic vocabulary used by the Ardennes novelist, and the techniques of its textual explication, makes it possible to decode the features of locally limited units and characterize the social status of a regional speaker and their worldview.