Much like Elves and Dwarfs have a special skill trait for their troop type. Have a a single troop type that is Immune to Transform (which isn’t even a current trait).
I suggest the troop type as Mystic. Lore wise, it makes sense that they all have a “spell” that keeps them from transforming.
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“Immutable!”
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Good word.
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Mechs! Because if they could transform, they would be known as Transformers, and that would be a copyright infringement. 
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