A common ancestral stock could be interesting, though I might have to rethink the migration patterns. Maybe instead of having the Tll-Ikish come from the north, they come from the east, heading NW, with the Chalmeans coming from the same place, but going SW, like this...

I'm not completely sold on it, but it's a definite possibility.
Biwám could also become a thriving mercantile crossroads, where goods and ideas meet, leading to some syncretism. Presumably the Biwám would have little trouble following the gods and faiths of many cultures. This might be a good place for a prophet to found a religion, too.
BTW, what do the Chalmeans think happen to them after they die?


