Demon invasion.

I finally managed to beat him! Orange kept trying to reach me, but I ran between castles, and as soon as he came through the teleporters, I would quickly turn around and run to another castle, gather reinforcements and caravans, and repeat the process. I managed to acquire almost all the best artifacts, and with 18 points in Sorcery, I could take down 40 of his Temptresses in one chain. After several weeks of these maneuvers, I was in a strong position, and he didn't dare approach anymore. I captured a third castle and defeated him. Screenshot: https://imgur.com/a/P4wik I focused on increasing attack, logistics (most important), mechanics (to break through defenses without losses using a tent and a ballista), defense, and luck. Now I'm starting a war with the Dwarves, and I'm already a little scared.