Dis-Hell's Crucible.

[TheMenacer]

I realize that I keep saying that you should cut stuff, but here we go. I'm not much of a fan of adding all of those types of mephits. Tiny demonic spirits of steam and smoke would be totally awesome just because you can imagine a troop of enemy soldiers closing in on some foul machine that's belching smoke everywhere and then, horror of horrors, the smoke turns out to be alive and it tears them to pieces. Other than that, like I said before, I'd shy away from making straight demonic units if only because I don't find a nation made up of random demons to be particularly compelling. A nation made up of possessed machinery and corrupt smiths imbuing their weapons with the souls of the damned? Now that's interesting.

Just my dumb opinion though.