Reminds me of a sword I made in the late 70's.... only its green... not made of light... its complicated.
It is a complicated system.
The limits to its systems is capacity without burnout, and data storage for energy patterns. They tend to hold energy in a pattern that maximizes storage, like said, kinda of like a juggler.
The energy sources are held in a higher dimension, 4th or greater (Which is not time but hyper space).
They tend to hold a EDMD focal point to tap it.
I will likely have something about this later.
But a single Neutron star, even a Blazar, or even a blackhole, even a galactic, is not enough for their needs. At the same time the leave their energy systems at a 'hum' level.
There is always the danger of burning out the universe which they are NOT wanting to do. Lots of safe guards. Even the 'heat' added to the universe seems to accelerate the death of various universes they might visit.
They have the ability to travel any distance almost instantly (4D), time travel (5D, which they rarely do because of causality branches), and even parallel or divergent realities (6D).
Usually though they settle to having a water park on their ship and just relaxing as they do their science hobbies.
Well, they never need refueling. And they prefer to keep the matter in energy form. (Keep it cycling in a circle)
Power system is not unlike a Zero Point module, but they also have traditional energy systems as back up. Even a blackhole would be nothing to its energy capacity.
Generally their energy signature is zero. Because it is displaced, both the ship and the energy.
They also have multiple isolated energy modules, just in case.
They are not interested in overkill if they do not need to. So other then the visual, you often do not even get a gravity wave from its displacement.