[Saxon]

It is my understanding that it also effects how high you can raise your dominion. If you raise it to 3, the enemy only has to undo 3. However, if it is at 7, they have more work to do. I am currently trying to clean up some captured provinces and the enemy had high dominion. It is taking forever to sort out…

You can effect this by building more temples. I believe that every 5 temples you build boosts the number by one. This represents 1000 gold for most races, so it is not a small investment.

Finally, and I am not sure about this, it may effect how many of your dominion scales com into effect. Each province has a dominions score as well as a rating on each of the scales. I would love clarification if lower dominions only allow you to effect a smaller number of these. If that is the case, a lower dominion would lead to you having less of your chosen scales come into effect.