We wanted to believe you. We wanted to believe that the strongest man in the world was there to save us. [...] But we were wrong.
~ The Devastator
At the end, I hope you understand the truth, Clark. I hope you can feel my hate. Because you did this. Like you did on my world. Like you do on every world. You made them believe. You fooled them into always thinking that you would always be there for them, to save them, to lift them up, to make them better. And that belief is exactly what will drag your entire world to devastation.
~ The Devastator
The Devastator, also known as The Destroyer, 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.
The Batman of Earth -1 had always been wary of trusting Superman, fearing that one day he would go rogue. Unfortunately, Batman’s fears would become reality when Superman suddenly murdered Lois Lane and began slaughtering people for no apparent reason. The Caped Crusader hoped that he'd find some explanation as to why Superman would turn on them so he could somehow save his friend but was unable to before he was forced into fighting the Man Of Steel himself.
Batman fought Superman with a Kryptonite-tipped spear which was soon disposed of when Superman amputated the arm Batman clutched his spear in. Superman then expressed his disappointment that after all the debates over who would win in a fight between the pair, a spear was the only thing Batman had to fight him with. However, Batman soon revealed that the spear was just to draw attention away from his real weapon; a modified Doomsday Virus that he then injects into himself. After transforming into a gigantic Doomsday-like creature (which regenerated his missing right arm in the process), Batman proceeds to pummel Superman before pushing a spike through his chest, killing him.
Batman’s victory came at a cost however, as the Doomsday Virus began to spread across the planet and transform everyone into mindless, rampaging monsters. With Batman unable to stop the spread of the virus and the world nearing its end, he accepted an offer from The Batman Who Laughs to join the Dark Knights and became known among the group as The Devastator.
The Devastator can be seen as the literal interpretation to one of Batman's worst fears; the fear of a renegade Superman, broken trust and where it takes him.
It should be noted, however, that in other DC media, such as the video game Injustice: Gods Among Us, Superman indeed falls into villainy, kills The Joker and goes to rule the world. However, the difference is how Batman himself handled the situation.