Although the War-Armour was untested, Robotnik donned it in order to face down Brutus when the Trooper attempted to depose Robotnik and rule Mobius himself. The two seemed almost evenly matched, although Brutus was able to crack the Armour by using the blaster on his arm. Robotnik retaliated by using the weapons built into the Armour's own arm: a spray of liquid nitrogen, with which he froze Brutus solid. The extreme cold made Brutus' metal body extremely fragile, and Robotnik was then able to shatter him with a single punch.