Heroes 5.5 WarGame Edition - Tactical Edition.

Looks cool, and such a racial unit is indeed powerful.

This is, of course, good... But what about the Sylvan faction? Their racial skill was weak, didn't work from the start, didn't work in breaking through defenses, and (possibly) won't work in the "battle of titans" (i.e., the main heroes' battle) - and it remains the same. And NCF further exacerbates the situation.

P.S. As for the machines, there's an option - they are heavy (let's see, carry siege equipment with your army) - so let there be a movement penalty for each unit of equipment. The rushers with machines will die out as a class.