The secret to making the Fourth Bridge fly—and to making this handheld device work—involved a rare metal called aluminum. It was what the Fused used for weapons that could block Shardblades, but the metal didn’t just interfere with Shardblades—it interfered with all kinds of Stormlight mechanics. Interactions with it during the expedition into Aimia earlier in the year had led Navani to order experiments, and Falilar himself had made the breakthrough.
