Blue Lantern Corps

Within DC Comics continuity the Blue Lantern Corps was established on the planet Odym by two former Guardians of the Universe, Ganthet and Sayd, who were effectively banished from the Guardians for permitting emotional expression. Motivated by the conviction that the blue light of hope is a distinct cosmic force, they organized an interstellar corps of ring-bearers who draw on that blue light to enact a mission that includes recruiting bearers and collaborating with other emotion-based Corps when cosmic conflicts arise.

Members are identified primarily by their blue power rings and by manifest blue-light constructs created by those rings. The Corps' seat is the planet Odym; notable individuals include Saint Walker, identified as the Blue Lantern of Sector 1. Visual trademarks in the source material emphasize blue light-based constructs and ring effects rather than a single uniform description across all members.

Blue power rings draw on the blue light of hope to generate energy constructs, produce healing/cleansing effects, and interact with other emotional lights. In the comics Blue rings can boost or recharge Green Lantern rings when Green willpower is present, enabling combined effects greater than either alone. Blue rings have been used to counter Red Lantern effects (e.g., Saint Walker aiding Hal Jordan/John Stewart), to aid attacks on Orange Lantern constructs, and to combat constructs from other Corps in large-scale events such as Rage of the Red Lanterns and Blackest Night. Their most potent functions are frequently conditional on cooperation with Green willpower or other Corps.