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Gleamstones (輝石, Kiseki lit. Pyroxene in the Japanese version) are magical stones important to the story of Fire Emblem Warriors.
The Gleamstones are five gems required to give the Shield of Flames its full power, similar in nature to the gems in the Shield of Seals. They reside within heroes that have been pulled through Outrealm portals into Aytolis. As Rowan and Lianna make allies of these heroes, the Gleamstones within each hero release themselves and attach to the shield.