I like Bloodshadows idea to give it a time counter you can pump up with 3
.
Also, in my opinion burrowed should be killed instantly, because they need air to breathe, but they can't swim.
Immaterial/Ethereal/Immortal... probably should be unaffected - they can shift out of the flooded plane to avoid drowning and I agree that elementals are 'outside' the flood (or else non-water elementals should drown
), so immaterials should be able to attack.
Also game-wise it allows for more interesting battles - right now quint seems more useful than anubis, but this way anubis would get a boost (becoming a kind of counter to flood), but also quinting your fallen druid (if he happens to come when you already have 7 creatures) then trying to mutate skeletons/or/whatever/you/mutate until you get a
or
or immortal mutant would make it more interesting
should be immune to flood, because most air creatures do not need to land at all, they can feed of fish/whatever-food-is-floating and they can sleep while flying... and anyway I would say a battle of elementals (metaphorically) lasts probably a few hours, not days or months, and I imagine flood more like a tsunami, a short event, maybe a while longer than a rain of fire, but not lasting days or weeks.
The problem is there is no 'flying' status or ability in elements, and dragons indeed have wings, but it gives them no advantage, but I guess defining flying creatures as
ones probably makes the most sense in simplicity and game balance.
And I am not sure if bigger creatures drown faster or slower, but as far as I guess, most creatures have a density similar to water, so no matter how big they are, they would be able to float, at least holding their head above water. At least in case of animals, bigger ones are equally capable of swimming as small ones (a horse can swim as good as a dog or a mouse, also some big dinosaurs were probably able to swim, and I am not talking about plesiosaurs), so in my opinion size does not matter... more important is if a creature is able to act normally when swimming, or can float, but without much control (so is washed away by the flood), or is indeed so incapable of swimming it drowns.
and a massive dragon would probably drown straight away due to his density being probably higher than average