Imagine airship fighting in Underdark, that's pretty cool.
Fungus could be your light source.
It could make sense lore-wise. Surely Angleans, in that cold, must have a grand city or something below ground.
replace water hazard's sky box.
done.
New faction: Dwarfs.
Gun that shoots steam.
Engineers get golden war hammers to replace their mallets.
Everyone is short and has a beard. Even the ladies.
Live underground. But oddly.. still fly airships.
Yep. Muse: We need this.
developmemt of sky whale technology is muse's top priority.
Maybe in coop mode, sky whale fleets driven by dwarves would be a nice compromise (that being the said the ideas you'd suggested are kind... lolwhut? I mean guns that shoot steam?)
Here's a suggestion for you.
Instead of humans finding gun powder dwarves have created guns using pressured air via heating water and various hydraulic mechanisms.
For example their version of the merc gun is a single shot shell via high air pressure. And only dwarves can craft this weapon because only dwarf-metal is strong enough and heat resistent enough (to maintain its durability) to contain the needed pressure for the gun without exploding from the high compressed air.
Primary weapons are slow shooting guns, like merc and artemis that fire in much greater range and increased power (as if firing lesmok and charged at the same time).
Naturally the problem of such weapons is slow reload time (as building up pressure takes time) and less clips. Because released pressure is only good for one shot.