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Well, they could at least include a couple of units from other factions as cameos, initially as free neutral units, and have them reside in certain dwellings, perhaps in future patches. For example, they could add a unicorn as a creature or golems – like in Heroes of Might and Magic III, where various types of golems lived in the Factory.
But, of course, everything comes down to balance.
But, of course, everything comes down to balance.