From the Introduction

Nobody remembers how or why. Maybe nobody ever knew. The oldest living survivors have childhood memories of it: cities burning, society in chaos then collapse, families set to panicked flight, the weird nights when the smoldering sky made midnight into a blood-colored half-day.

Now the world is not what it once was.
Look around you: evidently, certainly, not what it was. But also close your eyes, open your brain: something is wrong. At the limits of perception, something howling, everpresent, full of hate and terror. From this, the world’s psychic maelstrom, we none of us have shelter.

The second edition revisits many playbooks and core rules with small but cumulative changes.