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If replacing units in Wintrial isn't planned, I could help with translating content for this faction and balancing the units using a calculator and tests, as I have some free time right now.
Also, since the mod will feature 7 evil and 1 neutral (Conflux) races, I suggest coming up with something for the Holy and Unholy Word spells.
I read through the topic and saw that you're planning a narrative transition from the Ashan that the developers originally intended to the one where the described factions exist. I can suggest a plot point like a global cataclysm that occurred shortly after the Sareth storyline (you've already discussed its ending and influence a bit, which I think is good): this would make it easier to manipulate the history of the factions, and you could also rework and rethink the Ashan map, deciding who lives where and where the conflict zones will be (this will be useful if you plan on creating stories for the tavern or even a campaign). Okay, I think I've gotten a bit carried away.