Quick lessons about space:

• hyperspace is not really another plane, but it feels like it. It's actually dimensions 4+. They all have 0 width but energy can still fit "up there". There's much more energy in Hyperspace than regular space (it may in fact be Dark Energy). Hypermatter immediately decays into normal high-energy matter/energy upon intersecting regular space.
• voidspace is the space "below" a vacuum, the zero-point space. Normal energy decays out of the universe into the void over very long timescales. Every now and then (on the order of trillions of years), a single particle collides with the "barrier" between void and normal exactly when a mirror particle of the same mass does. They bounce off each other, returning to their respective universes, but when they do, the void particle transfers entropy to the regular particle. This explains proton decay and helps explain this universe's tendency toward entropy.
• hyperdrives and certain powerful non-matter beings can "rotate" themselves into hyperspace, changing their relationship with physics. This leads to FTL, or realms entirely within hyperspace, etc. This also explains the basis of psionics and other forms of "magic", as hyperspace both allows for an intelligent mind to connect with other minds (or rocks) "spookily at a distance", and also provides the extra energy required to do impossible things in three-space.
• voidspace is a little more tricky. To get into hyperspace, you need a lot of energy--to get back, you need only rotate back in and expend that energy. But to get into voidspace, you need to decay out of the universe, and to get in...you can't. Nothing can. Ever. It's not a place to visit. It's the Underworld, a one-way pass, thanks to the laws of thermodynamics. However, that doesn't preclude something from below meeting you at the border and making an exchange--you get a perturbation in the natural quantum foam (ranging from an advantageous die roll to a Boltzmann Brain to a sudden vaccum collapse), and they get...something, probably nefarious. Also, your Universe gets a fuck-ton of entropy.

Thus, we have a basis for:

• psionics (and really all forms of "arcane" magic if you want them)
• warlock-style invocation, with a decidedly quantum, probabilistic flair

So how do we get the other cool shit?

Nature magic: combine the flavor of the Spore with hyperspace, I suppose.

Divine magic: well, what are gods? Tune in next week.

Divine Magic

Not too different from vampire times, except the emphasis is less about supplicating yourself to a supreme being in exchange for power, and instead becoming a supreme being with that power, even if only briefly.

Most practitioners follow a religion, which may include a divine intelligence that might have ordained creation, or might be the end of the universe instead of its beginning, or is all minds unified in the potential of hyperspace, yada yada.

Few of them obey primitive ideas such as "give me goat's blood and I'll rain on your crops". These religions acknowledge the vastness of the cosmos, as well as the preponderance of resources in the universe that favor life with a certain baseline technology. Nobody really needs to pray for rain anymore. Rather, their religions concern themselves with higher mysteries that even advanced civilizations can't answer, such as:

• why are the laws of physics what they are, when they could have been something else?
• why is the Universe so friendly to life? Life can only live within a tiny portion of the timeline of the Universe, so how lucky are we to live in it?
• how can it possibly be that random events can turn interstellar hydrogen into working brains that can do things that nature could never do?
• what IS life? WHY is life?

And of course...

• what happens next?

The existence of near-mythical, ethereal beings with unfathomable power, such as the Asgardians, doesn't exactly deter religious thinking. And yes, many people worship these ethereal beings, but they are clearly not gods--although I suppose they might behave like those old-school gods. Probably should have mentioned them first. Whatever.

Church of the Light

A popular faith holds that a singular, eternal force known as the Light is the reason there exists any Universe at all, and that said Universe is so friendly to life. The Light wished us to exist, it loves us, it wants us to be good stewards of what it gave us, and it awaits us in death, where we will be reunified with it and with all other minds.

They teach that negative thoughts, greed, selfishness, pain, anxiety, etc are creations of the Void meant to interfere with the Light's mission, and that they should be overcome through application of will. Methods suggested include meditation, social support, sometimes even chemical assistance.

At their best, these people are essentially preaching "be excellent to each other" and are quite harmless, even benevolent. At worst, they can act like a weird cult that wants to drug people into being soullessly content 24/7.

On the magic front, they believe that, through meditation and discipline, humans and other intelligent beings can purify themselves. Stripped of the corruption of the Void, the simplicity and limitations of the animal mind, and, to an extent, the sullen weight of the body, the intelligent mind is unfettered, and can rise--all the way to the Light, in some cases. It is a celebrated thing when one is so enlightened that they skip right to the end of their journey, leaving their body to rejoin the Light, but that is not seen as ideal. Enlightened individuals who can prevent themselves from ascending "too far" have so much to teach from their lofty perspective.

And they're also powerful. Because they've basically become partially fused with Hyperspace.