The Lunar-class Cruiser makes up the backbone of many Imperial Navy Battlefleets. There are over six hundred in service with the Imperium in the Segmentum Obscurus alone. Its (relatively) uncomplicated design dates back to the dawn of the Imperium, and it can be constructed at worlds normally unable to build a ship of the line. Its variety of weapons batteries, Lances, and torpedoes make it both a versatile combatant and a dangerous foe. Most Rogue Traders fortunate enough to acquire one of these potent vessels remove the torpedo tubes to add more cargo space instead. During the 12th Black Crusade, also known as the Gothic War (139-160.M41), more than twenty Lunar-class vessels took part in the fighting against the Chaos Fleet of Abaddon the Despoiler.