During the long period of isolation that followed the collapse of the Sixth Age many human settlements failed altogether. Advanced civilisations declined to barbarism. Only in a very few places was the light of knowledge carried onwards. One such place was Isori, with its long history of technical expertise and the unique resources of the Isorian system behind it. Applying their vast technical skills the Isorians began to improve space drives and discovered ways to increase the endurance of spacecraft and their crews. The flexible nature of space-fabric had long been understood, and the Isorians used this knowledge to build ships capable of reaching near-light speeds previously thought impossible.