If you missed any of our Blackest Night primer, make sure to check out the index post for basic information, links to all the other posts and the schedule for upcoming posts. When you're ready, hit the jump for everything you need to know about the Blue Lantern Corps. Also, much like yesterday's Red Lantern Corps primer, this one was written by Matt and, due to time zone issues, I'm posting it for him.
Emotional Spectrum: Hope
First Appearance: Final Crisis: Rage of the Red Lanterns #1
Homeplanet: Odym (Sector 2682)
Leader: Ganthet & Sayd
Key Stories: Rage of the Red Lanterns, Agent Orange
With strong hearts full our souls ignite,
When all seems lost in the War of Light,
Look to the stars --
For hope burns bright!"
Initiation: The choosing of new Blue Lanterns is a very selective process that differs greatly from any other corps and has been shown to take days worth of discussion. It is an education process provided by the two leaders, Ganthet and Sayd, regarding the necessity and power of the Blue Light. Each sector has (or will have) a Blue Lantern Corps member to represent them and the selection of candidates is done by the Blue Lantern of the sector before. For example, the Blue Lantern of sector 1 selects the candidate of sector 2 and the Lantern of sector 2 selects the candidate of sector 3, and so on. Because of the difficulty and length of this process, there's relatively few Blue Lanterns at the moment.
Powers: The Blue Lantern Corps claim to be the most powerful of all the corps, asserting that the Blue Light is the one that burns brightest. Blue Lanterns harness the power of hope from the emotional spectrum to create powerful constructs and perform amazing feats. For example, using the hope of a whole planet, two Blue Lanterns were able to regress a dying star to an earlier stage, thus preventing it from exploding.
The constructs of the Blue Lanterns are based on the hopes of the target and work by soothing the emotions of said target. Additionally, the Blue Lanterns can amplify the power of Green Lanterns to incredible levels, sap the power and charge of Yellow Lanterns and cleanse the rage from people infected by Red Lanterns.
Weaknesses: Blue Lanterns can only operate to full capacity when in proximity of a Green Lantern. Without the presence of a member of the Green Lantern Corps, Blue Lantern rings only provide the power of flight and protection from the vacuum of space. For this reason, the Blue Lantern Corps want Hal Jordan to be their leader. Additionally, it has been hinted that the use of a Blue Lantern ring is "costly" to the wielder and that induction into the Blue Lanterns could lead to eventual death.
Ganthet & Sayd (Sector 0)
Former Guardians of the Universe and founders of the Blue Lantern Corps. They are involved romantically with each other.
Saint Walker (Sector 1)
Blue Lantern of Sector 1 and the first person to join the Blue Lanterns Corps. He deputized Hal Jordan into the Blue Lantern Corps, in order to save him from the Red Lanterns, by placing his own ring into Hal's hand.
Warth (Sector 2)
Blue Lantern of Sector 2, selected to join the Blue Lantern Corps by Saint Walker. He physically resembles the Hindu God Ganesha and was involved in the battle of Ysmault alongside Saint Walker and Hal Jordan.
Hynn (Sector 3)
Blue Lantern of Sector 3, he was shown during his selection process with Ganthet and Sayd at the end of Rage of the Red Lanterns.
Sercy (Sector 4)
Similar to Hynn, she was shown at the very end of a story arc during her recruitment, her appearance being at the end of Agent Orange as Larfleeze attacked the Blue Lantern homeworld.
Hal Jordan (Sector 2814)
Deputized into the Blue Lantern Corps by Saint Walker, from the Sector 2814. The power of the Blue Light cleansed him from the Red Lantern infection, but caused interference with his Green Lantern ring. Because of Hal's possesion of a Blue Lantern ring, he became involved in a prolonged fight with Larfreeze of the Orange Lanterns, who wanted the ring for himself. During the encounter, Hal tapped into the blue ring and expended all of its energy reserves. Once depleted, it determined that Hal was not a suitable Blue Lantern and left to find a new host.