Barbarians are good =) Regarding the deserts, there's already the Academy faction that lives in the desert and rides elephants; they could have made snow barbarians (Vikings), but they already made snow dwarves...
They could add swamps, but it doesn't really suit barbarians...
It would also be nice to bring back the Reptiles from part 3 and make them a faction: keep Goblins, Lizardmen, and add Bugbears, and something else similar.
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