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The Blue Lantern Corps is an organization appearing in comics published by DC Comics, derived from the emotional spectrum. They debuted in Green Lantern vol. 4 #25 (December 2007) and were created by Geoff Johns and Ethan Van Sciver. Their powers are fueled by the emotion of hope.
The Blue Lantern Corps are one of the nine corps empowered by a specific color of the emotional spectrum within the DC Universe. They have begun to fill an increasingly important role within Green Lantern and Green Lantern Corps as major participants within the Blackest Night crossover event. First formed by the banished former-Guardians Ganthet and Sayd, they are based on the planet Odym and their powers are fueled by the emotion hope.
The creation of the Blue Lantern Corps is rooted in the events that transpired during the Sinestro Corps War story line. During the first half of the event, Ganthet and Sayd serve as a dissenting voice among the Guardians as they acknowledge that the Blackest Night prophecy within the Book of Oa is coming to pass. Their willingness to embrace emotions and the love they have for one another leads to the two being banished from Oa. Two issues after their exile, Ganthet reveals the Blackest Night prophecy to the reader, Hal Jordan, Guy Gardner, John Stewart, and Kyle Rayner. In his description he says: "Elsewhere, a flicker of hope will shine from deep space, like a lighthouse warning the ships away from the rocks. The blue light will hold the line in spirit if not in strength". It is revealed at the end of the issue that Ganthet and Sayd have settled on a planet (later named as Odym), have created a blue power ring, and intend to form their own Corps.
