Heroes 5.5 WarGame Edition - Tactical Edition.

Centurion

Or maybe "legate" would be better. Actually, you could assign Agrail, the Overlord, and Grol to the warrior class, and Grok, Marbas, and Nimues to the inferno class. Visually, that would be a better fit. And it would fit the Roman theme. I'm not sure about how well the specializations match up, though...