It's a cool mission. I really liked the concept of darkness, but for some reason, the AI can still run into it, and once it does, I can run in too.
The only thing I would definitely do is remove all the friendly dragons from the map. I would replace them with unicorns or wooden creatures. By the end of the game, a yellow Anwen with hundreds of tier 1-4 creatures each came running to me, and it became impossible to win, but after raising 2 packs of dragons, the danger became very low, and the overall difficulty in destroying other AI disappeared. If it's a game with friends, then it's a top-notch game, but the AI is too dumb, but that's already a problem with the game itself.