Aaron said in this thread: http://forum.wastelands-interactive....970-some-ideas that there could be a mentalism spell that could capture a town:

Quote Originally Posted by Aaron View Post
Also, stealing entire towns with powerful metalism spells is fairly awesome
So, I think this should actually be a city enchantment that costs a mana upkeep each turn. If you stop paying the upkeep, the city goes back to the original owner (or non-alligned if it was independent). I do think that the larger the city, the more resistance it should have- with capitals having a super high resistance. What do you guys think?