The Vengeance Frigate, despite possesing no shielding whatsoever, is actually surprisingly very durable and can leave the biggest battles unscathed, thanks to the very strong armor. Their Mass Driver Cannons can disrupt shields and damage the hull upon impact, making them very useful against corvettes and lighter frigates like the Acclamator Cruiser. They work well with pretty much anything, especially Keldabe-class Battleships.