The Phalanx-class Star Destroyer Mark I, also known as the Phalanx Mark I or PSD for short, was initially developed by Oremin's top scientists with the idea in mind that this ship would eventually become the mainstay of the Laro Order's navy. The result was a sturdy vessel that was more durable than a Victory-class Star Destroyer and that could be produced at a significantly reduced cost.
The key to the low cost and the higher than average armor rating is the fact that the Phalanx-class is largely modular. In addition to making it easier to construct, it also adds a versatility to the vessel that a small government like the Laro Order can take advantage of. In addition to its standard configuration, the ship can be easily modified to fit all types of mission profiles. From dedicated science vessels, to fighter carriers, to more heavily armed variants meant strictly for warfare, the Phalanx can cover a wide base of needs.
The Phalanx-class has also been designed to eliminate the weaknesses that show up in large capital ships, especially older model Star Destroyers. The shield generators have been taken off of their traditional place atop the command tower and put in a much safer location. The standard configuration also sports twenty quad laser cannons and ten multipurpose warhead launchers to deal with the threat of starfighters and ballistics from enemy ships - something larger Star Destroyers are ill-equipped to handle.
While the standard configuration lacks the firepower to make it a serious threat to larger vessels on its own, the Phalanx is able to take a heavy amount of punishment and still operate effectively, making them a threat in large numbers. In addition, the Phalanx is able to achieve great speeds for a capital ship of its size by sacrificing a heavier weapons payload for increased power to its large engines.
At least one modified version of the Phalanx-class has become a standard design. The Phalanx-class Mark II is a more heavily armed variant of the ship that sacrifices speed, and starfighter support, to fit more heavy weapons to better combat other conventional capital warships. However, considering the Laro Order's wish to remain largely neutral, not many of these more heavily armed variants are known to exist.