The Normydia Crisis, Book 3: Fall of Normydia

In the distant future, far from the ruins of Earth, the end draws near. The Ascent is in the grip of total warfare, and the lines between friend and foe are becoming ever more obscure. Should the three castes fail to unite against their common foes, all will be lost.
The conflict on New Babylon nears its final, bloody conclusion. Even as mighty fleets in orbit and great armies on the surface fight on, new enemies threaten doom upon the rebellious world. If Knight and Squire of the Trinity survive, even greater perils will yet await them.
The planet Normydia bears witness to a battle of titans Count Anselm must hold the Ascent together in the defence of his homeworld, but which of his enemies will prove the greater threat. Yet even as war wages among the stars, the fate of Normydia may well depend on those left on the planet below.