The Siege Perilous class Deep Stand-off Attack Ship II was designed as a next generation successor to the versatile and venerable Righteous Fist of Heaven Class, and at the time of the fall of the Systems Commonwealth, this was the newest and most advanced ship class in the High Guard fleet. The design of the ship incorporated new structural features due to many hard-learned lessons from the recently concluded Magog hostilities at the time, and included latest in Commonwealth technology. They were used by the Alliance of Nations during the events of the war after the revival of the second Commonwealth.