Earth 15 is a graveyard universe, once home to a virtually perfected Earth prior to the events of Flashpoint as Earth-15 before being destroyed by the mad Superboy Prime. The Cosmic Grail's exact whereabouts are unknown, as it remains hidden somewhere among the many worlds of the Multiverse.
Earth 17's Atomic Knights of Justice of 21st Century is on a mission to seek out the elusive Cosmic Grail, the only weapon that can defend Earth 17 from a threat worse than any nuclear war—Darkseid the Destroyer.
- The Cosmic Grail seems to be based on the Central Power Battery of Oa, the reservoir of power for the emotional spectrum of willpower, and channels the energy used to empower the Green Lantern Corps.
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