Counter to "Fog Warriors"?

[Micah]

Rain is mundane and won't break fog warriors, but would be great if you can sacrifice a province and a mage or two to pop the enemy mages. Same with earthquake. Arco's mages can't do either of these though. Maybe 2-3 E2 mystics with some earth boots and a very small group of bodyguards to avoid death by flyer could manage to look innocuous enough to the AI to get off summon earth power/earthquake without them casting fog warriors on their turn. Scatter the 3 groups around the field so that arrows won't get all of them and hope that at least 1 or 2 of your guys makes it through to get the spell off.

I'd do this without your army there to kill his evocation squad off, since either of those spells will probably hurt your army and mages pretty badly as well. After that's done and you just have to deal with foggy mammoths and not lightning spam I'd throw a half-ton of sybils and mystics at him with a banner of the northern light and watch soul slay do its thing. All your S1 mages should script power of the spheres so they can cast it as well if you can spare the pearls, paralyze if not. Phoenix Power/Prison of fire for any F2/S1 mystics would be a good choice as well, and will save pearls, although the storm Caelum usually brings along will make your mages' fatigue shoot up pretty fast.

Flaming arrows is also a go-to spell against anything with trample or fog as well. Storms and arrow fend will probably shut down most of your projectiles after round 1, but it's still a pretty good use of a mage to cast it if you've got a lot of ranged units.

Hold your line with your own elephants to slow his guys up, especially if you go with prison. Give your casters as much time as possible to do their thing. Might throw a couple of curse of stones in as well to fatigue them and slow them down, plus it'll split their formation up since it won't hit all of them. Mass regen if you have it is a wonderful choice for your elephants, and your soul slayers don't care if he casts it back at you.

Hope that helps, it might be a bit too long-winded =)