GULEIL

Wormhole Science -
Shortcuts through SpaceTime.
The movie Interstellar touched upon this idea slightly. I was expecting a lot more to be honest, considering that Kip Thorne, the founding father of Wormhole Science, is on the Executive Board of the movie. But they showed some aspects of the science at least, a visual aid explanation of how SpaceTime curvature can potentially allow for FTL (Faster Than Light) equivalent shortcuts. They used a Deus Ex Machina notion (a wormhole that mysteriously shows up near Saturn).

In State/Craft contexts, we industrialize this concept. Exalted beings known as Arch-Pivots utilize nearby exotic matter at the outer edges of candidate stellar systems, and essentially invoke a wormhole to shuttle test particles over to far out destinations, FTL.
In this case, the test particles are not spaceships, they are minor planets of the ilk of our Pluto, in the Kuiper-equivalent belts of each stellar system which is a part of the Visceral Empire.
Arch-Pivots along with lesser journeymen pivots operate Guleil - which is a transfer and exchange mechanism for such minor planets amongst partner stellar systems.
The below graphic illustrates this concept -