Proto-Duodoseic language

Proto-Duodoseic (PDuo) reconstructed ancestor of Duodoseic languages.

Morphology
Words in Proto-Duodoseic encountered itself to have a special coda compost of /-s -V -l -r -n/.

Gender system
Previously Inanimate and Animate merged to form some kind of new system based off Neuter-Common, old Inanimate are classified as Common and Animate are classified as Neuter, such system would develop to become other systems in daughter languages.

Vocative developed from the Second person singular pronoun, that through time eroded with the meaning to add emphasis, thus evolving into a vocative case, it's also unique among other cases because it requires the whole stress of the word to shift around.