MMC File:S-Class.jpg The Supernova Class Heavy Tank, often known as the S-Class Tank was developed by the Misthalin Marine Corps in the year 370 of the Fifth Age, after the great success of the Leviathan Class Heavy Tank. The S-Class Tank was in many ways superior to its predecessor, being provided with a upgraded multicannon and a mortar, as well as increased speed, mobility, firepower, and space.