Lamerok
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Based on the description, it strongly resembles a map from The Restoration of Erathia - Realm of Chaos (Allies) / Kingdom of Chaos (with allies).
However, you can choose heroes there, and the colors aren't quite the same.
There's also a neutral alliance of the Stronghold and Fortress, but otherwise, everything matches very well. It's most likely that one.
Thank you, but it's not quite right.
