Nashan is a Sern-Cahilan language spoken along what we know as the Gulf Coast and Mississippi River valley in the 2000's AR, with minority populations of speakers throughout the Americas. It is a member of the Sern branch of Sern-Cahilan languages, and as such it is descended from Hvasvan and a distant cousin of Arodjun.
A Sern-Cahilan conlang in the Dog Days Universe
Below is the Google Sheets document for Nashan, which includes its full phonological evolution since Hvasvan, tables with pronouns, declensions, conjugations, and more. It will continue to be updated over time.