Um.

What's a 'singularity'?

A gravitational singularity is a discontinuity in spacetime typically caused by an infinite energy density, such as inside a black hole—

A black hole, or singularity, forms when a dying star collapses with such gravitational force that it breaks through the planes and creates a gash in space—

Yeah! That thing!*

(*Given your general tech level, we'll forgive a little imprecision here and there.)

—that sucks everything nearby into a portal to the Void—

No.

—effectively mirroring the portals to Creation's Forge found at the center of stars.

What. No, seriously, what?

—okay, your stars don't run on nuclear fusion. We now have additional questions.

Look, there's a spell called Interplanetary Teleport, I don't know why you expected general relativity to apply.

You have black holes!!

(This is, actually, one of the things Keltham checked before initiating a physics-based plan to destroy local reality.)

More generally, most ways to not have a causal speed limit don't look like Interplanetary Teleport, they look like not having a coherent concept of space at all. Your universe looks suspiciously like dath ilan's universe with a few hacks bolted on top for one that apparently isn't that at all.

I guess Keltham's astronomy books didn't mention the sceaduinars.

Sceaduinars form spontaneously and fully grown from the geometrical errors in the crystalline knots in the Void, where the negative energy concentration is greatest. Unlike nearly every creature in existence, their creation has nothing to do with positive energy, and their soulstuff is made from negative energy. Due to their divorce from Creation's Forge, sceaduinars are completely incapable of creating anything. They can guide natural processes, like the growth of spheres of annihilation, but never truly invent.³

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Although they are created from pure entropy, the areas near a sceaduinar's home are among the few places stable enough to sustain outside life.⁵

WHAT WHAT NO THAT IS NOT HOW ANYTHING WORKS

We're beginning to suspect that, rather than merely having different physics, y'all simply don't know what the ass words mean.

The Negative Energy Plane is full of perfect crystals of pure entropy!

AAAAAAAAAAAAAAAAAAAAAAAAAHHHHHHHHHHHHHHHHH

Okay. Okay. If, hypothetically, your universe had a neighboring brane with a lower vacuum energy density, it might make sense to call that the "negative" "energy" "plane", and any ordinary matter brought there would spontaneously decay, which might have lead you to claim that the true-vacuum contains "pure entropy" if you only sort of understand what entropy is.

So, then, if Keltham creates a rift to the Negative Energy Plane not enclosed by an event horizon, it should trigger bubble nucleation—

Patched in beta 0.14. We had a little bit of a hiccup the first time someone tried out the 'undead' mechanic, but that's fixed now.