Summons

[krpeters]

Troops with a high attack and damage will eventually do enough damage to kill them. Each statue costs two earth gems, so he's not going to have a lot of them.

And they do move slowly, so they're fairly easy to go around. Have a lead infantry force attack them head on, and have a cavalry force off to the side with orders set to hold and attack rear/archers. With luck, the cavalry will go to the rear, kill the mage, and that will be the end of the statues.