The Fused have a second metal I find fascinating—a metal that conducts Stormlight. The implications for this in the creation of fabrials are astounding. The Fused use this metal in conjunction with a rudimentary fabrial—a simple gemstone, but without a spren trapped inside. How they pull Stormlight out of a Radiant and into this sphere remains baffling. My scholars think they must be employing an Investiture differential. If a gemstone is full of Stormlight—or, I assume, Voidlight—and that Light is removed quickly, it creates a pressure differential (or a kind of vacuum) in the gemstone. This
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