The Khaya languages' raison d'être is that I wanted to make another logographic script--but not just any logographic script: I wanted to make something in the vein of Classical Mayan. It also provides another substrate for the Tim Ar-O languages to pull from.
The Khaya languages were originally spoken starting around 1750 BC in an area roughly centered on the Khaya Plateau; the modern language family, however, is scattered across various localities in the Tim Ar Empire.