Demon attack.

IMHO - No one needs to be weakened; everything plays out perfectly, even on the "hero" difficulty - I started playing yesterday. I defeated two yellow heroes (one fled, and I completely crushed the other), defeated Alaric (without letting him escape), captured two blue outposts, repelled an attack by one demon, developed the castle to the level of a Capitol, and built generators for all creatures, except for dragons - I don't have enough resources for them yet, but I don't think it will take long.

As soon as I have time, I'll finish the game and write about it, but right now, I'm busy with pre-holiday work.