The Lord of the Unliving — death itself.
Nekron
Nekron is not a man, a monster, or even a god — he is death itself, the personification of the end of all things, and the ruler of the Land of the Unliving, a realm adjoining Hell. He first appeared in Tales of the Green Lantern Corps #2 (June 1981, Mike W. Barr, Len Wein, and Joe Staton), where he drew his power from the souls and spirits of the dead. For nearly thirty years he lingered at the edges of the mythos — until Geoff Johns made him the architect of the darkest chapter in Green Lantern history.
In Blackest Night (2009–10, Johns and Ivan Reis), Nekron was revealed as the mastermind behind everything: he forged the black power rings that reanimated the dead, collaborated with the corrupted Guardian Scar and his herald Black Hand, and — in the aftermath of the Sinestro Corps War — captured the Anti-Monitor on Ryut, turning the destroyer of universes into the Black Central Power Battery. When the Black Lanterns' power reached one hundred percent, Nekron was summoned just outside Coast City, towering over the living world.
His plan was total: not conquest, not revenge, but silence — the return of the universe to lifeless emptiness. He was even revealed as the secret author of the DC Universe's miraculous resurrections, a deed long attributed to other forces. Nekron fell only when the White Light of life restored the Black Lanterns to true life and severed his connection to the dead. No villain in the mythos operates on a larger scale: where others threaten worlds or corps, Nekron threatens existence.
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Blackest Night #5 (2009), main cover. Alex Sinclair (cover artist (publisher credit)); Ivan Reis (cover artist (publisher credit)); Oclair Albert (cover artist (publisher credit)). Artwork source & details.