In my first Doms I game, I was greatly amused by one AI horse archer commander who kept escaping battles with my troops. He lost an eye, and finally, the other eye, but kept returning to lead men into more battles, and to give missile "support" by firing randomly around the map.
As for Utterdark, if there are multiple opponents, they will all try to dispel the Utterdark, and they may tend to together have higher gem income than the one casting Utterdark. An impressive spell, though.
PvK