Can anything be done about Armageddon?

[Yvelina]

In my current game, someone I am attacking is casting Armageddon. It is late in the game, I assume he has a huge gem income, and practically all of his remaining provinces are castled - the ones that were not fell on the first turn of my attack. Armageddon does not change the balance of power, so I am not too worried, but it certainly is a pain - I like to be able to plan my turns, and that is kind of hard when one fifth of your units, mages, and magic smiths die every turn.

I have already learned that domes do not help. Reducing him down to nothing is inevitable, but will take at least ten turns. Is there anything I can do to protect my servants, apart from trying to kill his mages, reduce his gem income and take over his labs? (all of which I am doing anyway)