The term "draft of Riverius" refers to the initial version or preliminary outline of Riverius. Synonyms for this phrase include "Riverius' first draft", "Riverius' preliminary version", "Riverius' initial outline", "Riverius' rough draft", and "Riverius' early rendition". These synonyms indicate an incomplete or unrefined version of Riverius, often created as a starting point for further development or revision. They emphasize the preliminary nature of the work and provide alternative expressions to convey the idea of an early draft or incomplete representation of Riverius.