Green Lantern Corps (2006) #43 (Online Order Only)

Red rain falls!

As the Black Lanterns continue their reign of terror and chaos on Oa, things go from bad to worse when a horrible loss for the Green Lantern Corps results in Guy Gardner becoming so enraged that he becomes a Red Lantern! And hell breaks loose as the Central Power Battery faces an attack from the newly arrived Black Lantern Corphans!