A number of factors came together allowing Nekron to birth the Black Lantern Corps into existence.
The dying essence of the Anti-Monitor, flung into open space by Superboy-Prime during the Sinestro Corps War, was drawn to the long dead world of Ryut. There, it was encased within a black Central Power Battery by Nekron. Scar, a dying Guardian, secretly conspired against the universe and authored the Book of the Black. On Earth, a villain called Black Hand became increasingly aware of a black power within him.Realizing what was required of him, Black Hand killed himself and rose from the dead as the herald of Nekron's power. With his rise came a horde of black power rings that scattered through the universe and recruited the dead into the Black Lantern Corps, beginning the Blackest Night.
Origin
Nekron is the ruler of a dimension that borders Hell, Limbo and Purgatory. His realm serves as a place where the departed souls of all who have died await passage to their final destination, good or bad. Since Nekron receives power from the souls who inhabit his realm, he is constantly trying to obtain more.When the rogue Maltusian scientist Krona is banished by his brethren and trapped in energy form, he somehow reaches Nekron's realm. This results in a paradox that Nekron uses to his benefit. The paradox is caused by an immortal being like Krona occupying a realm meant for the dead, which results in Krona’s immortal energies leaving a tear in the time and space between the mortal universe and Nekron's realm. The tear allows Nekron to see into the universe of the living, but is not big enough for a being as powerful as Nekron to pass through. Wanting this universe as his own, Nekron recreates Krona as a being of immense power and sends him along with an army of similarly empowered spirits to kill the Guardians of the Universe so their immortal energies will tear the rift between the two realms wider and allow Nekron to travel between the two.
Krona and his new army are able to murder some of the Guardians, along with some of the Green Lantern Corps during their first attempts, and they are also able to destroy the Central Power Battery of Oa, preventing any of the surviving Lanterns from recharging their rings. Hal Jordan, in his usual attitude of never giving up, rallies the remaining Green Lanterns together, and convinces them that they should at least use everything their rings have left to try and stop Krona from advancing any further. Krona is eventually defeated when Hal is able to cross over into Nekron's realm and convince the souls of the Green Lanterns that had died in the recent attack to rebel against Nekron. This distraction gives the remaining Guardians enough time to banish Krona back into Nekron's realm of death and close the rift between the two dimensions.
Nekron
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"The Blackest Night falls from the skies.
The darkness grows as all light dies.
We crave your hearts and your demise.
By my black hand... The dead shall rise!"
