With darkness black I choke the light, no brightest day escapes my sight. I turn the dawn into midnight, beware my power... Dawnbreaker's might!
~ The Dawnbreaker’s oath.
I missed them. I couldn't take it anymore. I didn't want to be Bruce Wayne. I didn't want to be Green Lantern. Standing in front of a lantern ... but feeling submerged in shadow. Like I never left the cave under my mom and dad's house, with the darkness, and the bats. So I became ... Batman: The Dawnbreaker.
~ The Dawnbreaker
The Dawnbreaker is a villainous version of Batman from the DC Comics universe. He is a member of the Dark Knights, a group of vigilantes from the Dark Multiverse whose goal is to assist the deity Barbatos to plunge the central DC Multiverse into darkness.
On Earth -32, while walking through a back alleyway, Thomas and Martha Wayne were shot and killed by an unknown gunman in front of their son Bruce Wayne. As young Bruce mourned over the loss of his parents, a Green Lantern Ring appeared and chose him to become a member of the Green Lantern Corps. Bruce decided to use the ring's power to locate and kill the gunman who shot his parents, but the ring protested against this action and refused. However, Bruce's willpower and anguish overloaded the ring, which reprogrammed it to carry out the task.
Immediately afterward, Bruce tried to use the ring's powers to revive his parents, however, he only ended up turning them into horrifying zombies, further disturbing him. Bruce then began using his powers the fight crime with lethal force, but it did nothing to help the sorrow, anger, and emptiness he felt inside himself.
Eventually, after murdering Jim Gordon for questioning his methods, Bruce was confronted by the Green Lantern Corps who attempted to arrest him, but he slaughtered them all using nightmarish constructs that reflected the void he felt within him.
Afterward, Bruce further empowered his corrupted ring by entering the Green Lantern Power Battery, then rejected his identity to adopt a new one inspired by the cave of bats beneath Wayne Manor, Batman. Eventually Earth -32 began to break apart because of Bruce's ring, and The Batman Who Laughs appeared to offer the doomed world's Batman a place among the villainous Dark Knights as The Dawnbreaker, stating that Barbatos could give Bruce the one thing he wanted; his parents.
Before become a Green Lantern and dooming to the world.
Bruce kills Jame Gordon of Earth -32
Bruce Wayne kills the Green Lantern Corps and Guardians of the Universe from Earth -32.