Obviously, on the upper difficulties the computer-controlled opponents pose a serious threat to the player. I usually only play on Noble, but regardless of difficulty level (I think?) the computer controlled civilizations tend to be develop a natural blanace of power among themselves in games. Sometimes, though it's rare, a single AI will pull ahead of the others and manage to dominate the game. Back in Civ3, I noticed for some reason that it was usually Egypt that did this. In Civ4, the one danger I really fear is when an AI founds a religion that becomes tremendously widespread and gives them a powerful economy with a very fast tech rate.
AIs war with each other all the time, and sometimes even manage to gain a good chunk of land, but in years of playing Civ4 this is the most powerful I've ever seen an AI become.
Surprise, it's Isabella. She has near-complete hegemony on her continent, with mastery over six (!) other civs. This game is gearing up towards a pretty crazy world war.
So what kind of killer AIs have you seen in your games?
AIs war with each other all the time, and sometimes even manage to gain a good chunk of land, but in years of playing Civ4 this is the most powerful I've ever seen an AI become.
Surprise, it's Isabella. She has near-complete hegemony on her continent, with mastery over six (!) other civs. This game is gearing up towards a pretty crazy world war.
So what kind of killer AIs have you seen in your games?