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a teleport device/portal between the main Earth and Earth-3. That's how the Seven Deadly Sins were originally released "here". In this theory it swaps folks between the Earths but somehow they retain the memories of who they were swapped with. Or it allows the Earth-3 folks temporary control over their counter-part here.That may explain why Vandal Savage felt such regret when he touched the box (Earth-3 Savage would be good) and why Superman (who now may be UltraMan or controlled by him) killed Dr Light. Batman has no Bruce Wayne counter-part on Earth-3 so he would be immune to the transfer effect. That would also explain why Batman is siding with Luthor's team to battle The Crime Syndicate during "Forever Evil".