What issue did the Red Lantern first appear in?
Red Lantern Corps
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During the Blackest Night event, the Guardians of the Universe are shown observing the War of Light unfolding among the various Corps of the emotional spectrum; one of the scenes depicting the Lost Lanterns confronting the Red Lantern Corps in order to retrieve Laira's body from Ysmault. As the seven Corps battle one another, a new eighth group powered by death is introduced to the DC Universe: the Black Lantern Corps. Black Hand, a leader of the new Corps, releases black power rings that reanimated the deceased in order to recruit members to their ranks.[16] Just as Atrocitus steps into the fight against the Lost Lanterns, the black rings descend on Ysmault, seeking the bodies of Laira and the four deceased Inversions.[17]