Red Lantern Corps

The hate that founded the Red Lantern Corps came out of the infamous Massacre of Sector 666, during which the Manhunters exterminated life in an entire sector. The five survivors of this unthinkable genocide swore vengeance upon the Guardians of the Universe and became the Five Inversions terrorist cell. These five beings were eventually brought down and crucified on the hellish prison planet Ysmault, where one's rage continued unyielding. This one, Atrocitus, delved deeper into his dark magic in search of a power to strong enough to exact his vengeance.

Eventually, Atrocitus found his power in the Emotional Spectrum's red light of rage and the means to access it via blood magic. Crafting a red lantern, he bludgeoned one of his fellow Inversions, Qull, to death and anointed it in blood. He then bled out all his fellow Inversions to fuel the new Central Power Battery of the Red Lantern Corps. Atrocitus has felt a need to exact revenge against Sinestro, which leads to later actions by the Red Lantern Corps against the Sinestro Corps, and specifically Sinestro.

Another harsh penalty the Guardians employed due to the danger the Red Lanterns represented was to authorize a strike on Ysmault itself to wipe the Red Lantern Corps out. The Alpha Lanterns and Lost Lanterns were dispatched for the job, but the priority of the Lost Lanterns was only the recovery of Laira's body for a respectful burial. The Alpha Lanterns struck with ruthless efficiency, executing every Red Lantern they could on sight, while the Lost Lanterns fought their way to Laira. Neither side of the conflict realize what was happening in the rest of the universe and what was about to reach them. 

Black power rings rained down on Ysmault, reanimating all the victims of the Red Lantern Corps and deceased Red Lanterns such as Laira. Atrocitus was left facing his fellow Inversions, who he slaughtered to create his corps. However, it was discovered that Red Lanterns had advantaged against this Black Lantern Corps that others did not. A Red Lantern could survive the heart-harvesting attacks of a Black Lantern, because their power rings had replaced the need for their hearts already. Red Lanterns were immune to the Black Lanterns attempts to feed on their rage. 

While Atrocitus joined forces with representatives of the other Corps of Light to fight the source of the Black Lanterns, the Red Lantern Corps entered into a truce with the other living corps to fight the Blackest Night. When matters reached their worst, Mera was deputized into the Red Lantern Corps to assist Atrocitus directly in the fight against Nekron. The extent of her rage surprised many but was found particularly appealing by the Red Lanterns' leader, Atrocitus.  

On Oa, Vice was released again and used to help fight back the army of Black Lanterns attempting to destroy the Green Lantern Corps' Central Power Battery. Despite his rampage proving very effective, he was killed by Alpha Lantern Chaselon, who could not see past his programming and executed Vice as an enemy of the Green Lantern Corps. However, Vice's red power ring found its way onto Guy Gardner's hand. For a brief time, he became a member of the Red Lantern Corps until his friends succeeded in freeing him of the ring.

During the crisis back on Earth, Atrocitus confronted the Spectre and mistakenly tried to claim him as the Red Lantern Corps avatar of rage. The attempt failed with the Spectre claiming not to be the rage entity the Red Lanterns seek and warning Atrocitus that truly finding the entity would be disastrous for all involved.  

The full Red Lantern Corps along with all the other Corps of Light soon caught up to Atrocitus on Earth when all the Black Lanterns converged on the planet. They fought together to hold the line against the Black Lantern horde until the power of the White Lantern could be used to finally end the Blackest Night.  Mera was relieved of her red power ring and her rage at the sight of her resurrected husband, Aquaman. Her heart went into cardiac arrest the ring stating her rage compromised.