Boulder-class Heavily Armored Tank, or Heavy Assault Tank, was a fully-armored and fully-armed battle tank used by the Triumvirates during the great Triumvirate-Sith War until the dawn of the Triumvirate Civil War. It was designed to withstand a high amount of heat. Other than that, it was created to hold any type of attack 'thrown' by the enemy. Although, its strengths and toughness have their limits.