We stood atop a small, barren mountain, looking down. Near us, only a few hundred yards away, was an immense wall, the kind you’d use to hold out the Mongols if they were the size of King Kong. It was built entirely from ice or some kind of translucent crystal. Even from here, I could see that there were chambers and rooms in the wall, rooms containing barracks, hospitals, kitchens, you name it. There were dim and indistinct forms moving around in them. The walls were lined with what had to be tens of thousands if not hundreds of thousands of soldiers. I peered, trying to get a better look,
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