Red Lanterns Origin

The Red Lantern Corps are first mentioned during the "Sinestro Corps War" storyline. Foreshadowing another major crossover event in the DC Universe, former-Guardian Ganthet reveals the Blackest Night prophecy to the reader, Hal Jordan, Guy Gardner, John Stewart, and Kyle Rayner. The prophecy describes a War of Light between nine Corps powered by the lights of the emotional spectrum. Part of the prophecy reads: "A force of hate will rise as the Red Lantern is anointed in blood. The bearer's rage unfiltered and unchecked."
According to DC continuity, before recruiting sentient beings to the Green Lantern Corps, the Guardians formed a robotic army called the Manhunters to maintain order across the universe. After eons of service the renegade Guardian, Krona, altered their central programming, leading them to believe that the only way of maintaining order was to completely eradicate the universe of all known life. Sector 666 falls victim to this new philosophy when the Manhunters slaughter all but five of its inhabitants. The five survivors become known as the Five Inversions; a terrorist cell bent on the destruction of the Guardians of the Universe.They are incarcerated on the planet Ysmault, where one member, Atrocitus, is so consumed by his rage that it results in the formation of the first red power battery. Atrocitus had previously escaped at times, only to be defeated and returned. On one such occasion he fatally attacks Green Lantern Abin Sur;but Atrocitus is returned to confinement by (then Green Lantern) Sinestro.Atrocitus uses his power battery to bludgeon Qull and the other Inversions to death; however, he expresses more interest in exacting revenge on Sinestro.