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No, no! It's not a bug! To open the gate, you need to kill Cyril! I reached Cyril, killed him, and the gate opened without any problems! HOWEVER, I didn't get the "TERMINATOR" achievement, even though all the neutral creatures died bravely... the same thing happened with resources. Maybe you're right, Winner, these achievements should be earned in a scenario, not in the Campaign.
In short, the summary: the map is very interesting and challenging!
For those who will play it, I advise you to read all the messages here - THEY REALLY HELPED ME!