[Cassia model 2 (electric boogaloo) (mounted vampire lord)]

Nicely done!  Just a name suggestion, what about having her last name be Van Helsing?  Would be a fun twist.

[Time of War: Ghur: ' Shrouded Fens']

The campaign sounds great!  The only comment (I hope helpful) I have is that your weather rules will favor melee-focused armies.  A few ways you could handle this to make it more equal for armies which rely upon or which include lots of ranged attacks:

1.  Make a roll first to determine whether the weather chart should be used - maybe even roll once/turn to see if the weather has shifted and then see what the effect for that turn is.

2.  Add ranges to the shooting penalty for each weather effect (you do have one in there for 18".2" is at -1 to hit).

3.  Add more movement penalties for some effects - i.e. Torrential Rain should likely have -1 movement or something due to mud/slippery conditions.

Also - by -1 morale - I am assuming this is for Bravery and Battleshock tests?

Look forward to seeing the campaign progress!

[Some Endrinrigger Freehand and a YouTube Batrep]

The freehand looks great on them!  Excellent idea!

[Mhornar Test Scheme]

I like it so far!  Regarding the clouds - that is tough.  I would also have started with cotton.  I have had some success using fine to medium grade steel wool (used it to make flames) as it can be formed and the fine pulls nicely.  It can still be a bit tricky to paint, and can "break" if roughly handled (the fine wool), but it may be a useful alternative. 

Another possibility, though seasonal, is to use big piles of milkweed or cottonwood seeds.  Very fluffy and white - but would be hard to paint.

 

Aether gold is technically invisible I think, so you wouldn't have to show it, but once you get a cloud idea together, you could intertwine golden thread if you are looking for  thin veins of aether-gold.

[All yarr base are belong ta US!]

I love that artwork too and you have incorporated the tentacles very well!  Nicely done!