Arandor
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I like the idea, it's a good concept, but it's unlikely that Nival will create an add-on with the Swamp, and if they do, they will create a file that adds a new race to the game. You'll have to do it yourself. And have you already thought about what the units themselves will look like? Gorgons and Mighty Gorgons can be left as they were in the 3rd part.
Added 6 minutes later
And have you thought about the heroes, their names, and everything else?
Added 2 minutes later
For level 7, I would put a wyvern, similar to the wyvern in the 3rd part, but with a slightly different appearance.
Wyverns, Dark Wyverns, Wyvern Queens.
It won't be possible to add a wyvern, because they are already with the orcs... and everything is already thought out)) I don't think Dogma will change anything)
P.S. The heroes are also thought out and posted in the topic (although they can still be tweaked)) I just don't remember on which page...
Be strong. Believe