The roof of Waters & Moore Fiduciary Exchange was a small wonder of unnoticed architecture. Each tile was made of thin-cut marble in a most flattering shade of faded green. The builder, a famed goblin crafter whose name was remarkably silly even by local standards, had used an enchanted chaos saw to transform massive blocks of the stone into finger-thick slices. Most importantly, each tile was slightly curved with a simple notch on the bottom. The roof was assembled with no mortar at all, . . .