The Viper is the division of heavy-armored Terran soldiers like the Firebat and the Marauder. The armor color of the Viper appears to be Green. The Viper's armaments are corrosive acid sprayers which can almost instantly melt small biological units down. The sprayers have slightly more range than a Firebat's Perdition Flamethrowers, but the Vipers can also toggle their armaments' mode into Armor corrosion mode, which launches a different type of acids that can corrode enemy armor. This makes an army of Vipers with both modes almost unstoppable from the ground.