Man I kind of want to scold you for this obvious and cheap salami tactic! If you keep that pace with all the 6(?) races and probably more than 6 units/race you could single handedly fill all the dev journals until december, if you add units from "dwellings" all dev journals until 2019 starts could easily be filled... But if all units are that cool - Then I wouldn't even mind. Looks great!
There are! - Examples in AoW3 were nightshade fairies, and sorceror heroes can also make a whole stack completely invisible with "master illusionist". Shadow Magic had leprechauns. But thinking about "Universal Camouflage" - I wonder how vision will work. The same way as in AoW3? (standard 3 hex vision range, see concealed units with true sight and/or when directly adjacent to them)?[...]I don't think there were completely invisible units in the previous games, any Concealment could be countered by having variable terrain. [...]