The Touchstone is a limited edition playbook for Apocalypse World.
From the introduction
At the earliest reaches of living memory, the world collapsed. Cities raged, burned, or just died in agony, starved, fell silent. The sky howled. Not everyone who remembers it remembers it the same way. People forgot who they were, where they had come from, what they could make.
Now, in this world of filth and blindness, there are a few with new vision. They go among us at war, indomitable and doomed, hoping and fighting for something better.