Fallen Knight

Through trial and error, I figured out how to deal with the blue faction in the first month of the game. You need to let two of the first blue messengers (not very strong ones) live, but also not let them reach the castle (their task is to attack it). It's difficult, but it turned out to be possible (although it's hard to believe). I'll keep playing, and if I find anything else, I'll let you know.

Added after 19 hours and 4 minutes
I encountered another bug: Holy Flame is taken without an artifact, just like that! Banning the portal to the city is a bad idea. The constantly spawning blue units are also not the best move.