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Component gemstones of the fabrial protecting Urithiru from the Fused occupation — several of them, hidden around the tower and connected to the crystal pillar by veins of crystal that carry Stormlight. As long as they remain intact and charged, the shield holds. Because they need to be reachable to be renewed, the enemy reasons that at least one will be sited where storms can reach it. SA:RoW:Ch 56