Hello, AstralLein!
The map was a bit challenging for me, but I still managed to complete it. I noticed a bug at the end when Bertrand appeared; I got a little scared and ran away. I was very surprised when he almost wiped out his entire army against a secondary hero. In the end, it turned out that he could be defeated with almost no losses, which I don't think is how it should be (version 2.1).
This is a quirk of the AI. It can be fixed with a single, separate script function, but Bertrand is a simple and not very important boss. The key remains Vessel.
Thank you for completing the map!