Counter to "Fog Warriors"?

[llamabeast]

Fog Warriors is an amazing spell - I know because I use it all the time, and it makes my men almost unkillable! Or at worst it effectively gives them an extra life.

I can't see that Earthquake will help once they've cast it, it'll just kill you horribly. If you can take out their mages before they can cast it that'd be good, but as Arco it's not like you'll have more hit points than they do.

As a counter, I guess you want spells with large area of effect to turn off the mistform. Anything with large AOE really - it only needs to do 1 point of magical damage (hence earthquake won't work as it's mundane) to turn it off. I'm too tired to think of any specific ideas right now though... (bedtime in the UK)