Armageddon

It used to be that Armageddon really meant that your tribe was wiped out, or at least destroyed with the survivors becoming integrated with another one.

Then it became a flood or other natural disaster destroying the local area, which was the destruction of everything since those beyond the hills weren't real people.

But the more power and control people got, Armageddon went from what would happen to us to what we'd do to ourselves, be it nuclear weapons, climate change, or just gray goo.

But, if it helps, when it comes, you won't even see it coming.

Trust me.