[Kuritza]

How about another land-based infantry unit for Caelum? Not as defenseless as Wingless, not as resource-heavy as sacreds. Paul Anderson described such unit in the War or the Wing Men, when that trader convinced the Wing Men that controlling the ground is just as important as controlling the skies.
Some bulky non-ice armor that prevents flying (and can be mass-produced), like standard chainmail or scale mail, and a tower shield. Such warriors can make big 'jumps' thus moving faster than average, but they wont fly. Read what Quantum says - 'ignore the flying infantry'; exactly, it can be ignored. A nation needs some infantry that can fullfil its purpose.
And in my opinion, cheaper Caelum mages (1W, 2A 1W) are baaaaaaaaaaad. As it is now, Caelum depends on mages heavily, so I think making their only real battlemage capitol-only will cripple an already average nation.