of the Anti-Monitor. One of Harbinger's duplicates was taken control of by the Anti-Monitor and apparently killed the Monitor, but the Monitor was able to use his death to create a pocket universe to contain the remaining realities from the Anti-Monitor's attack. After defeats by various heroes, including the Flash (Barry Allen) and Supergirl sacrificing themselves to destroy an anti-matter cannon and to save Superman, respectively, the Anti-Monitor absorbed the entirety of the anti-matter universe and traveled to the beginning of time, intending to stop the formation of the positive matter Multiverse and to create a Multiverse where anti-matter prevailed. When the heroes followed him there, he began to drain the power from most of them. However, the actions of the Spectre, empowered by the sorcerers of the surviving Earths, brought the Anti-Monitor to a stalemate. The villains of said Earths, sent to stop Krona from viewing the origins of the universe, failed due to squabbling, allowing Krona to see the hands of the Anti-Monitor and the Spectre struggling for domination, which collapsed the current Multiverse. From the ashes rose a new, singular universe. While various persons adjusted to the newly singular Earth (including those whose worlds and histories had been destroyed with the loss of the Multiverse), the Anti-Monitor, enraged, drew this new Earth into the anti-matter universe, intending to destroy this last bastion of positive matter once and for all. What followed was the Shadow Demon War, wherein many heroes and villains lost their lives against the Anti-Monitor's forces. Finally, the combined efforts of various superheroes and villains (most notably Doctor Light; the heroic Alexander Luthor, Jr. of Earth-Three; Darkseid; Superboy of Earth Prime; and Kal-L, the Superman of Earth-Two) were able to weaken the Anti-Monitor enough for Kal-L to deliver the final blow, destroying the Anti-Monitor by punching him into a star. The star went nova and caused anti-matter waves to erupt, threatening to destroy the entire anti-matter universe. Kal-L and Superboy-Prime were willing to resign themselves to their final fates, when Alexander Luthor, using his power to open dimensions, revealed that he had created a "paradise dimension", and he used it to prevent the Lois Lane Kent of Earth-Two from being erased from existence when the Post-Crisis universe was formed, as he foresaw how events would unfold and refused to allow Superman to have to deal with such a terrible loss. Using his own body as