End of the World

What caused your apocalypse Veeky Forums?

the PCs, of course

I had two That Guys. One sparked a civil war, the other blew a hole in reality.

I kicked them out, and am now running a post-apocalyptic fantasy game and Those Guys' characters are demonized worse than Fantasy-Hitler.

smugness level: astronomical

NoooOOObody knoooooOoooows!

Zargothrax, the Dark Sorcerer of Auchtermuchty.

A serious lack of nukes.

No nukes, no Cold War. Just one big, hot one.

Ideological struggle.

The people living in the world now don't even know they're living in a post-apocalypse world.

Wizards experimenting with daemon magic ripping a hole into the dungeon dimensions

Climate cataclysm. The world is now pretty much Mad Max without the gimp raiders.

How did the other guy blow a hole in reality?

What ideologies?

A a really weak gamma burst.

Not strong enough to kill of all of humamity, just enough strength to kill of technology and give all of humanity super cancer.