ick! Earthquake

[Gevaudan]

I'm currently playing marverni in a 10 player map, and am closing in on argatha. This is early game. much to my surprise, argatha has developed earthquake and badly mauled two of my armies (hundreds of casualties). Any advice for a counter to this spell? The argatha pretender is a pretty beefy pale one undead with D9E6N4S4.

I'm thinking about trying out a dominion kill or spending a few turns researching enough construction to pimp my E9 Cyclops and just stomp him.

thanks!