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Phew, I finally managed to defeat the pink "Legions of Pain". Here's how it went: I cleared the area around my castle and headed downwards, collecting everything I could along the way. I defeated the pink hero who came to meet me with minimal losses, then went further down and captured the settlement with the crazed creatures and the castle located below. After that, I went to the left (towards the pink player). He had two castles, one below and one above. First, I captured the lower castle, and then the upper one. At the same time, I was building teleporters in my castles because the orange player kept visiting me frequently, and I had to move from one castle to another. He managed to recapture one of the castles I had taken. Overall, I'm very happy that I got rid of the pink player. He has a teleporter on his territory, right next to the upper-left castle, and he will use it to recapture the lower castle. That's it. Now I'm going to try to drive out the orange player.