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Deplorably-Nameless
Got to think we may be dealing with a very highly advanced civilization type interaction or energy based.
While the world-ship civilization would logically carry all needed resources with it, it no longer truly fears the needs of travel. If it isn't an actual world, this civilization probably has the fabrication skills to create/scavenge/locate any need materials from anywhere. Especially if it can create it's own matter, a step below become an energy form itself.
A highly advanced technological world, where its scientific boundaries are so extended it would likely appear like magic to us, would likely have the needed materials to temporarily pierce a brane, step outside of the universe's constraints for a moment, then re-enter elsewhere. In a way, this type of civilization would logistically be more stable. They don't risk their world(s) to the rigors and dangers of space ie black holes, quasars, supernovas, etc. They are highly familiar of their environment (if they aren't outright engineering it). And as a bonus, they use less energy since they most likely power their services from the environment, such as deploying solar panels to draw energy straight from a star. A Dyson Sphere, for example.
https://en.wikipedia.org/wiki/Dyson_sphere
There are now two such locations where they are suspected of being.
In this universe, they draw from the environment, and when in travel, use extra-dimensional matter/energy to empower their ships. With a localized, central operation, they could strike out literally anywhere, and not strain themselves constantly by utilizing excessive amounts of energy constantly except when traveling.
The energy form is perhaps the weirdest theory. A full transformation into energy, releasing the need for any metabolic or physiological requirements. Photons take trillions of years to degrade, making them practically immortal. If they employ quantum entanglement as a function of their energy form, then they really could reconstitute themselves anywhere by altering light/energy across the universe till it mimics their own form. They'd be immune to the rigors of space travel itself. Hell, they could possibly use ambient spacial radiation to jump from coordinate to coordinate. But if they could do that, then it stands to reason they may have the ability to interact directly with Boson fields, including gravity. This opens the door to the possibility they could easily pierce a universal membrane, allowing them to side step any form of travel within this universe. They wouldn't need quantum entanglement, which requires at least light to be there already, to where they are going. There could be nothing at their target location, but by traveling outside the universe, they could leech off of other energy sources, then emerge back into this universe. And in the whole process, they'd sidestep any universal physical laws. And, they'd be avoiding major pitfalls from this universe, primarily black holes and lacking environmental comic radiation to manipulate.
What would make them scarier is that if they have this much control over energy (if an alien like this exists), they can cound control matter, which is a subset of energy. They'd be reasonably able to generate/create any material they need. A ship, out of nothing, on command.
Just some wild theories, but a possibility if they really do play with quanta like small children with building blocks. Of course, the movie Interstellar touched upon aspects of this, and theory of quantum entanglement to travel across the universe is being considered in earnest.
![[Image: dr-frank-n-furter.jpg]](https://i.postimg.cc/YvXrLWvY/dr-frank-n-furter.jpg)