I built all the dwellings, upgraded the Lizardmen and Assassins, and constructed a Guild of the 3rd level. I'm playing on War difficulty, but the interesting part is something else.
Whenever I appeared, no matter where I went on the first day, a green hero would follow me everywhere. It took me three tries, but I finally killed him and ran away. The next day, everyone was fighting, and only one Sinistar remained, who wasn't moving. I easily defeated him.