[Micah]

The best way to get rid of enemy dominion is to kill the nation that its attached to. Other than that it's really not much worth worrying about unless you've got an established border with someone you're not planning on killing any time soon, then it might be worthwhile to put a few preachers in to keep your scales in play. Research centers are also key to keep preached up if you have a magic scale. In general, though, bothering with dominion is a large waste of time, since the effects of it are very limited outside of pretender HP.