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My game also freezes when the yellow hero runs out. Maybe a patch will help... By the way, after there were a ton of skeleton archers, I left the rest of the army to another hero and only attacked with the archers without any losses. The Necromancer was simply a monster. I was playing on hero level. Maybe that's why such a huge army of skeletons developed. It's a pity that the yellow hero can't be reached because of the bug.