Origin of the Black Lantern Corps
The Black Lantern Corps is a fictional organization of revenants appearing in comic books published by DC Comics, related to the emotional spectrum. The group is composed of deceased fictional characters that seek to eliminate all life from the DC Universe.
Following the sciencell riot, the Guardians were observing the state of the Universe as the War of Light raged on. The Guardians realized that Ganthet was correct in his interpretation of the prophecy, and that the Blackest Night would occur. They then noticed a shadow spreading from Sector 666, and decided to recall the Green Lanterns to Oa to prepare for an attack. Scar, however, attacked the Guardians, killing one by tearing his heart out. Imprisoning the Guardians in her black blood, Scar explained that the Anti-Monitor's attack had not just burned her, it had poisoned her, killing her slowly and allowing her to come under the influence of the Black. Scar said that the Black Lantern Corps would succeed where the Green Lantern Corps and the Manhunters failed and bring order to the universe by destroying all life in it.