The Aleasani were, before their trip across the ocean, taller and stronger, and the Asani-Moroks/Gorns/Toron retained that height and strength because they were stranded on fertile semi-tropical volcanic islands. Then the Curse fell upon them, and many Asani began to be warped, made ugly and deformed as others died, causing most Aleasani to flee. They left many stranded because some were too hasty and selfish in taking the boats, and those who left came to the land they would name Aleasana. This land was full of mountains and valleys, and somewhat barren, with few areas appropriate for farming, and not much in the way of native fruits and vegetables.
With such a scarce food supply, hostile natives controlling most of this scarce food supply, and probably some amount of conflict amongst themselves from those who lost family or friends in the escape, the Aleasani diminished in size over time as they fought and conquered, being unable to eat well and adapting to the changes, perhaps with the aid of magic.
With any given piece of arable land or grove of fruit trees, it could not sustain as many men as it would take to defend from other starving Aleasani, so they couldn't hope to just hole themselves up around a farm and drive off other Aleasani; no one could eat well, because there were too damned many of them competing for any given source of food. If one former noble tried to claim a piece of farmland for himself, his defenders would be slaughtered by some other, stronger group of Aleasani looking for food. So inevitably they had to work together, and ration off what food supplies they acquired in their conquest over Dvergar, Shay, Urukhs, and whatnot. Thus, over time and several generations, they shrank to a more sustainable size, though many would have died in the initial food shortages and battles of conquest.
This is just a more detailed explaination of what I had originally posted on page 3 or so. To clarify for Sarellion.
Personally, when I mentioned they had fled from disaster, I had no intention of it being a civil war or something in their homeland. More like an invasion by monsters or something, most like, or the wrath of nature. Oi.
And Sarellion, Rhialto's original post mentioning Oldbloods was when he said Majera Alsea was considered an "Oldblood", and went on to explain her political inclinations against non-humans and arcanists and foreigners. There was no impression of Oldbloods being some subrace of humans.
As for the deities of Aleasana........ If you like, then fine, go ahead and throw away my last several posts about Aleasani deities. I already went to the trouble of making them fit into the group that Sarellion had created. But I never presented them as Northerner deities.
Bandesh-Thar might be the only city-state where worship of Dar is still significant, so Majera being Dominus of the religion and the city isn't necessarily a problem. Allies of Bandesh-Thar may have small followings of Dar, while still having parts of their populus dedicated to other deities.
As far as I'm concerned, there's no need to even confirm the existence of deities in a campaign setting, because their works could just be the result of faith from followers. In many official D&D settings, faith itself is power, and deities are nothing more than a conduit for that faith, not even necessary in some cases. Some settings differ, of course. So as far as I'm concerned, different portfolio elements could be duplicated in every pantheon, maybe even in the same pantheon, depending on the culture that founded that religion (or the culture that now follows it).