First formed by the banished former-Guardians Ganthet and Sayd, they are based on the planet Odym (later Elpis) and their powers are fueled by the emotion hope.

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.

[3] Two issues after their exile, Ganthet reveals the Blackest Night prophecy to the reader, Hal Jordan, Guy Gardner, John Stewart, and Kyle Rayner.

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.

Hal Jordan, reeling from the effects of an attack from (newly added Red Lantern) Laira, finds himself being healed by the powers of Saint Walker.

After which the two former-Guardians ask Jordan to aid the Blue Lanterns in rescuing Sinestro from Atrocitus, as his survival is important in the upcoming War of Light.

Warth easily keeps the two from fighting one another, while Walker keeps Atrocitus himself at bay (though admittedly is unable to douse his red fire).

Outraged, Jordan attacks Sinestro and is so overcome with rage that Laira's red power ring chooses him as its new host.

Surging with blue and green power, the outpouring of energy from both of Jordan's rings defeats the Red Lantern Corps.

In the aftermath of the conflict, the reader is able to observe Scar remarking on the forces gathering for the upcoming war, during which Atrocitus is shown performing a ritual to discern the location of the Blue Lantern Corps' home planet.

Sayd says that a new blue power ring will need to be made for Walker, as they are unable to remove his original one from Jordan.

[9] Distracted from the blue power ring by terrorist demands from Agent Orange, the Guardians launch an assault on Okaara in the Vega system.

Larfleeze attempts to remove it by force, by severing Jordan's hand with an axe made from orange light.

The details of the negotiation are not fully revealed to the reader, however it is shown that Larfleeze asked the Guardians where he could find a blue power ring.

On Odym, Ganthet, Sayd, and the Blue Lanterns are shown walking on a beach and talking with their newest member: Sister Sercy.

Unable to detect any dead bodies on the planet's surface to attach themselves to, the rings hover in the sky, waiting for a death to occur.

[13] Hal Jordan, Sinestro, Carol Ferris, and Indigo-1 arrive on Odym during the conflict between the Blue and Orange Lanterns in order to recruit Saint Walker to help form a white light composed of the seven lights of the emotional spectrum that will defeat the Black Lantern Corps.

[14] Saint Walker, Ganthet, and Sayd join the team Jordan and Indigo-1 have assembled, and accompany them to recruit Larfleeze and Atrocitus.

Despite saving him from the Black Lanterns, Larfleeze is resistant to join the group due to the nature of his power and an interest in obtaining his own Guardian.

To calm Atrocitus, Saint Walker shows him an illusion where he and a female of his species are happily being invited to the Blue Lantern Corps.

When the illusion proves insufficient, Saint Walker convinces the Red Lantern to join them by relating the story of how his family died in an effort to save his world.

He is quickly joined by Fatality, Arkillo and the Weaponer as Saint Walker and the Blue Lanterns are still trying to defend the Central Power Battery.

When he awakens he is informed by Hal of the events of Relics assault on the Source Wall and the death of Kyle Rayner.

[29] He later regained his hope, and his ring, after witnessing Kyle Rayner's White Lantern abilities on New Genesis, confident that the emotional reservoir could be refilled, which it was after all the entities sacrificed themselves to replenish the well.

Some time later, the Blue Corps appears to have settled once again on Odym, but the magically infused rogue guardian Koyos combines the energies of magic, the emotional spectrum and anti-chaos and targeted Zamaron, Maltus, the Helix (base of the Controllers) and Odym itself to destroy the Guardians of the Universe and cleanse the Universe from everything of the Maltusian line.

In the universe prior to the current one, groups managed to tap into the wellspring of power created by the Emotional Spectrum.

[46] Walker revives in time to assist in the final fight with Nekron, subsequently remaining with the Enterprise as it continues its mission.