[quote=@Cyclone]
For the human population, what about Kuro's people?

I also think that there should be more people in the independent villages/confederacies, because the Garakai keep talking about how they want to crush the southern tribes. I think some of Rtron's posts mentioned them being rather numerous but also mostly a bunch of peaceful farmers and poorly defended villages. Perfect for Garakai to conquer/enslave and for Ialu to "save" and "enlighten" with his teachings about the Mighty One.

In any case, assuming that the southern tribes makes up the majority of those 1800 humans, that's still something like a mere 1,000. That's just like five or six little hamlets, not really tribes.
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Human pop: 4000 Vestecians, 2000 Ialuians, 1800 Confederates (aka the Southern Tribes), 1200 Zerabilians
I'd say the Confederate is a united force made up of a few tribes, each tribe occupying a town or two. 300 people per village on average and you have 6 fairly large villages. That's something like 4 tribes (2 made up of two villages, the other 2 made up of one). They may have once been defenseless peasants, but I'd say they're a tad less defenseless now.
There would be more, except Ialu's extra 1400 are most likely ex-Confederates, and Zerabil did go around gathering followers, so it makes sense that there would be less of them than previously thought. Otherwise, we can increase the human pop and make it so they're 3800 with more villages and tribes.