[1] Born on Maltus, Krona is an Oan scientist who became obsessed with observing the origins of the universe itself, despite an ancient legend that said discovering that secret would cause a great calamity.

[2] Krona constructs a machine that pierces the temporal barrier and views the beginnings of time itself, but it explodes, shattering the universe and creating the multiverse.

[3] Krona returns to a physical state using Alan Scott's mystical power ring, but is again turned into his energy form by the Guardians.

[9] The Grandmaster's hopes are dashed, though, when it becomes evident Krona would continue even in his extremely dangerous location in his insane quest to view the birth of a universe despite the risks posed to himself.

After being told what has happened by a dying Grandmaster, the two teams get to Krona's stronghold, led by Captain America and coordinated by Martian Manhunter, pitting them against various brainwashed villains and increasing the scale of his 'recruits' as the heroes defeat each wave.

In the Trinity series, Despero, Morgaine le Fey and Enigma use the egg to create powerful monsters and reshape the world.

During the height of the battle Krona is imprisoned due to the united efforts of several heroes and villains, but is set free by Morgaine, finally snapped, claiming that if she cannot have the world, then nobody shall.

Moments after Earth's destruction he encounters its essence, the Worldsoul, which continuously alters its form between a little girl, an adult woman and an old hag.

Krona inquires about the law of universes, wishing to know how the Worldsoul and other entities like it function and exist, hoping to learn of some higher plan or design.

However, he is horrified to learn that the Worldsoul has no actual function other than to simply exist, resonate and, most importantly, to feel, to share in the positive emotions of every lifeform that dwells upon its surface, at one with the Universe in a Great Dance with the other souls of worlds.

After the events of Blackest Night, a cloaked stranger appears on Ryut, walking near an ancient temple with seven pillars marked with the symbols of the Emotional Spectrum and plotting against the Lantern Corps.

[17] The first act of this stranger's plan occurs with the abduction of the fear entity, Parallax, during the finale of "Blackest Night", imprisoning the creature within the pillar marked with the symbol of the Sinestro Corps.

[19] The stranger is also shown working with Hank Henshaw (Cyborg Superman), telling him that enslaving and altering the qualities of the Alpha Lanterns will restore his mortality.

The figure finally reveals himself as Krona, the rogue Guardian, long believed dead – the bandages serving to help restore his body after the damage he has sustained in his previous encounters – and tells Jordan that prior to his banishment by the Guardians, he was the caretaker responsible for protecting the entities, which explains how he's aware of the orange power of avarice and its location as revealed during Hal Jordan's first encounter with Larfleeze,[22] and that is why he can control them and the abilities they possess.

[23] Later, as Hal Jordan, Larfleeze, Atrocitus, Saint Walker, Indigo-1 and a returned Sinestro tried to reach Zamaron, since the entity of love was the only one still free, they found instead a delusional Carol Ferris who tells them that Krona had captured the Predator.

[36] Krona later finds John Stewart, Kilowog, Arisia Rrab, Two-Six and new Lantern Xrill-Vrek in a seemingly hostile territory, a long way from home.

[37] Krona possesses a supreme genius-level intellect, but his arrogance, lack of patience, short temper and above all insatiable hunger for knowledge have gotten the better of him.

Like the rest of his species, Krona possesses enhanced physical abilities, psionic powers (including telepathy and telekinesis) and virtual immortality.