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By the way, the desert faction definitely deserves to exist. Desert, evil djinns, nomads, nagas, and so on. However, this needs to be carefully considered to avoid creating all sorts of nonsense.
As for the Fallen, they are more suitable for Heroes of Might and Magic V, but they could also work for Heroes of Might and Magic III. They could be made into a neutral balancing force, necromancers who have embraced the light again, and so on.
Regarding new resources... This and other technical innovations need to be discussed in a separate thread. I will take care of it within the next week.