Location » Kronis appears in 1 issues.
They are near impenetrable prison cells located on the planet Oa. They are created by the Guardians of the Universe to house prisoners of the Green Lantern Corps.
In Pre-Crisis continuity, Supermanium is one of the strongest metals in the DC Universe discovered by Superman, most notably used by Superman in creating his Supermobile and to construct the giant gold-colored door and arrow-shaped key for his Fortress of Solitude.
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