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Krona is a villain who first appeared in Green Lantern Vol.2 40. He also serves as the primary antagonist of JLA/Avengers and one of the main antagonists of the Green Lantern franchise (alongside Sinestro). He is the arch-enemy of the Guadrians of Oa.
10 billion years ago, Krona, one of the most brilliant of all the Maltusian scientists, decided to break the ancient edict and probe the origins of universe itself. Krona constructed a machine capable of piercing the temporal barrier and viewing the beginnings of time itself. As he watched time peel away, Krona caught a glimpse of the hand of creation depositing the speck that would become the entire cosmos. At that instant, his machine exploded and the universe was shattered.
The universe then infinitely replicated itself. At this same moment, the Anti-Matter Universe was created, unleashing evil into the cosmos; thus, the Monitor and the Anti-Monitor were born. The Oans severely punished Krona for his misdeeds, turning him into a bolt of energy and sending him to forever wander the cosmos.
Krona was the main villain of the crossover comic event between the Justice League and Marvel's Avengers. In his search for the origin of the universe he destroyed hundreds of realities until he came to the Marvel Universe. There he met the Grandmaster, who challenged him to a game for the fate of that universe. The two cosmic beings forced the Justice League and Avengers to gather many powerful relics across both worlds, competing against each other to gather the most. Although Grandmaster won the game, Krona became furious and mortally wounded him, then proceeded to summon Galactus to learn the origin of the universe from him. After he killed Galactus, Krona wrecked havoc with reality. The Grandmaster had trapped Krona between the universes using the 12 items of power, but Krona began accelerating the process, threatening to destroy both universes. Krona intended to cause a new Big Bang he would learn the secrets of. The JLA and Avengers teamed up to stop him. Krona summoned mind-controlled villains from both worlds to hold back the heroes. He was defeated when the Flash and Hawkeye (who were previously thought dead) appeared, and Hawkeye fired a powerful explosive arrow into Krona's power source while Flash distracted him. Krona's reality fell apart and he was trapped in a cosmic egg, which the revived Grandmaster and Metron looked after.
The egg was stored in the Watchtower and monitored by the Justice League, and secretly Metron. However Krona was finally freed from the egg during the Trinity storyline.
Krona was eventually killed by Hal Jordan.