The Expanse
Science fiction
Matter in the Expanse is unstable and in constant shift, therefore, it is difficult to keep corporeal form or stable areas of land. Anything can be created in this realm, but its physical form will not last for longer than an hour. However, it can exist normally in the physical realm beyond.
Wonder
The Expanse's technology is complicated, so I will break it down in a few simple categories.
Guides
-Stable corporeal form-shifting
-Stable time travel technology
-Multiple settlements throughout the multiverse
Kilekh
-Unstable corporeal form-shifting
-Unstable time travel technology
(add more later)