So this issue deals with why and how Perpetua was locked away betrayed by her children and imprisoned behind a wall on the edge of reality.
Perpetua was still pulling strings from her prison creating events that would ultimately free her.
Perpetua creates her own team of Batmen, the Rainbow Batman Corps led by the baby Batman that was in Death Metal Legends as a short story.
The story wraps up with the Green Lantern Corps defeating the Rainbow Batman Corps with the help of Owlman betraying the crime syndicate and cementing his place as the true dark Batman something Owlman is obsessed with throughout the issue. The Green Lantern corps escape as the Earth collapses.