Are there any universal catastrophes that can happen in your setting?

The demons tearing apart the tenants of creation and unraveling the walls of reality, causing the void of churning chaos beyond the veil to spill forth and swallow all worlds, returning everything back to formless chaos.

Less of a universe destroying thing that a universe mechanic, but the basic idea is that the universe is a kind of loop, and there is a pinch in the loop running along it.
What this means is that the universe compresses into a singularity at the pinch and then creates a constant big bang at it's wake.
If intelligent life figures out this fact they will have to run from the compression of reality to survive, which is harder than it sounds as the pinch travels several times faster than light.

A cult of narcissistic transhumans are trying to create a new universe for themselves to escape to. What these geniuses haven't gotten is that when the second Big Bang goes off the wormhole connected our universe to the new one will funnel matter and energy into ours.

Ten internet points if you know which scifi novel I'm shamelessly ripping off.

pokemon diamond and pearl

A Tranny drew a comic. It sucked.

Basically the universe is finite, but loops, so anything going to through the bottom of the universe pops out the top, and gravity affects everything with a constant downward force.

In this void, fall triangular "worlds" - flat earths basically.

Then a civilisation mixed magic and technology too much, blew up their world.

And then the debris from it fell faster than the other worlds due to a higher terminal velocity, hiting other worlds and destroying them too.

Essentially a universe scale kessler syndrome has happened, so there's this wall of constantly falling world rubble that's slowly sweeping from one side of the universe to the other and a human civilisation is hopping from world to world to try and stay ahead of the disaster their ancestors created.

well is the comic any good?

OP here. It's shit.

Ah, that's a shame.

Note that the comic begins with a slime being pissed on by a unicorn and was supposedly about the slime refinding the unicorn to prove to the other slimes that unicorns are real.

The Xeelee Sequence.

Creatures from beyond are trying to invade through spheres of annihilation.

two have gotten through in the past, but reality is anathema to them, and they are destroyed upon entrance, but not without irreparably fucking reality in the process.

the first time this happened created arcane magic, and the second time corrupted divine magic, creating devils and demons.

if many more get through, reality will break down, and the beings that created reality will get really grumpy.

...

well, there is a empire of people who seem open minded an like pretty progressive dudes.
Who help the unfortunate and advance civilization in a broken world.
They are atually busy breaking reality in front of everybody.

Bump

So...
Basically the west's relationship to islam?

Except without the weak attempt to shoehorn /pol/shit into a Veeky Forums thread, yeah.

Yeah, but nothing intentional, and only those based off of existing scientific principles.

>heat death
>big rip
>big crunch
>endless black holes
>false vacuum

The last one scares me the most.

Yeah, false vacuum is a scary one, funny enough, it is likely the only thing that could cause it would be something with intent to push the boundaries of the universe, something we as a species are currently doing as much as we can with extreme colds, extrem hots, and plenty of other extremes that who knows which one could set off something like that.
The whole idea suggests that the pursuit of knowledge itself could be unimaginably dangerous.

What the fuck

...source?

Marathon Infinity, though all three games in that series are extremely good (if clunky) old-school shooters with a surprisingly intricate story told via data terminals. They're open source now, and you can play the games for free via the Aleph One sourceport.

That's the game that Bungie made before Halo right

I've only heard of it because it was used that time in Red vs Blue

Pretty much, yeah. There's a website floating around with all the terminal text and story if you don't feel like playing through the games.

the god who made my universe is actually a super genius from a different universe. he caused the universe to BIG BANG again but was able to survive it and become god. he created a pantheon of gods to kill him in case he went crazy, then created a bunch of cool planets with life on it. he also created eldritch beings on the edge of the universe. He went crazy, the gods killed him but had to leave the planet where my campaign starts to hold back the eldritch gods.

A race of beyond godlike beings that basically built the universe as a side effect of killing each other to become more powerful realised they were draining magic faster than it was being replaced. They teamed up, built a magic mirror portal to a different dimension so they could harvest it and continue growing and killing each other. One was left behind to maintain the portal from the home side. He had the bright idea of breaking it so this reality could be his alone. The magic of doing so shattered both him and the portal.
Time skip to current era, an ancient beyond godlike being is reassembling itself, with the help of doomsday cults and what not. If it succeeds the world is fucked as nothing could kill it at full power.
Oh hey, it broke this magic mirror a long time ago, maybe that's the key to stopping it.

So yeah, unless the party figures out the truth of the mirror and finds another solution, dimension hopping universe breaking beings are going to do their thing