So I was wondering why freed monsters always come rampaging for my cities, and I was able to screen shot the occurance of what is either a bug, or a really sad cheat:
I checked his city and it did not have the appropriate defenders to deal with the multiple groups of monsters wandering around, though his score should indicate that much. Several turns after this phenomenom, his borders expanded and guess what made it's way crawling for my closest city? You guessed it, a hoarder spider army...
