Water Tactics?

[archaeolept]

both water and air mages can forge items for leading troops under water. any water mage can go under water, and take along a number of human sized units equal to the mage's path in water. As well, most undead are poor amphibians. And, of course, since he's Ulm, you can just wipe him out on land and then dominion push him into non-existance.

once you have a sea province you can also buy a ton of tritons (most likely).