Lemme give a shot to a knock-off setting pitch, Gradine. See what y'all think.
Under the Shattered Sun
In the blighted wastelands of the once-azure world of Harad, thirteen warlords known as the Sorcerer Kings reign over what shredded remnants of civilization remain. The world burns underneath a darkened sun which covers half the sky and threatens to consume all. Those damned to live out their lives in this world toil and thirst, starve and die, to deliver tithes to the Sorcerer Kings to buy another day's water, another's days life.
In the vast wastelands beyond, horrors lurk within foreboding caves, rocky crags, and across the endless sands. What water may be found beyond the reach of the Sorcerer Kings is tainted, vile, and deadly to all who try to consume it. What plantlife is stunted, twisted, and swift to perish upon thirsty sands that drink deeply of the pitiful rains that fall.
Yet all is not lost. There are those who scrounge and gather, who prepare for the day when the reign of sorcerous tyrants comes to a bloody end. Who seek to restore what was lost, and to heal a shattered world. And in the darkest of times, a fire in the night can be seen for miles in every direction.
Cool! This could work, and work well.
Humble observations-
Nephilim instead of Sorcerer-Kings. This could be particularly appropriate if we think that the original sorcerer-kings were descendants of the cruel gods. This is what gave them an edge to throw down their ancestors, the actual divinities. Since they are not divine in of themselves, they are susceptible to mortal shenanigans. Once they have enough power to truly ascend then they will be beyond mortal reach.
I particularly like the idea that warlocks can / could be / are focused on making pacts with lost and broken powers. This is a situation where I would avoid the cleric, especially if part of the background is that the gods were cruel. However, I think having a warlock that bargains with the echos of Thor and Camazotz, for example, so that he can gain great strength, fly, see in the dark, and drop a thunderball every once in a while would be interesting.
I started thinking about how the Zevians have a different form of magic ("Astral", even) that focuses on stars, travel without movement, and other planar style abilities. They're trapped here like everyone else, but they can pull on and manipulate other planar energy to make interesting and unique mischief. A new monk (adept?) and perhaps paladin subclass(es) would be theme enhancing.
I can see the Marshal fitting well. Someone who is adept at leadership, so much so it is the focus of the class, would be a great hazard to the elite. Heralds are reskinned paladins?
Mutants abound, and the Unique let people play anything that doesn't quite fit. I like it.
Elementaari- hmm. I'm sure someone worked very hard workshopping the name.
Great pitch. This would be fun to work on.