Dark sun that isn't actually dark sun.
A third, uncharted continent, and a potential ally for either Xi-Xia or The Western Continents in the upcoming war. Settled by raiding tribesmen hardened by constant conflict and frigid winters, and backed with powerful primal magics.
Ruled (though not in name) by the most powerful tribal chief.
Home to legendary airwhales, which is one catalyst for tribes banding together: to hunt them.