children of the sky is just a poetic description of thu'um.
considering you're essentially their chosen one this time around i highly doubt you're going to be going up against any tongues in combat.
they're already confirmed for being in the game, though, so
"The further north you go into Skyrim, the more powerful and elemental the people become, and the less they require dwellings. Wind is
fundamental to Skyrim and the Nords; those that live in the far wastes always carry a wind with them." NOW being a game developer that
resource alone is enough to start building on. Make the map semi linear with all the bosses to the north. Fast travel has to do with wind or something.
(maybe an accurate version of icaration flight where you select where you wanna go on the map then get flown away to that location.)