Originally Posted by
godisawesome
Batman kills the Joker during his first year in the cowl. Having done it once, he finds the feeling of power and satisfaction to fulfilling and addictive on a personal level, and "there's no going back." He slowly expands his kill count from psycho killers looking for attention (Scarecrow, Zsasz) to genuinely irrational villains (Ventriloquist, Mad Hatter) and the sane criminals (Falcone, Maroni, Freeze), eventually kills Ra's and does take his place, and slowly transforms into a full on authoritarian overlord, like a human version of Sauron or a much less overtly dramatic Dr. Doom. He also indoctrinates his personal apprentices with brainwashing, leading to a scarily obedient Jason, Damian, and Tim, but a wounded Dick Grayson (already adopted before he started to go bad, and thus not brainwashed) and Babs (broken pedestal). Very cold, very sinister, and during his more contemplative moments, very introspective and somber in realizing how far he's fallen. (Incidently, he'd make a great Injustice 2 villain.)
Harvey Dent, now called Janus, saw what was happening, and even though he struggled with his own dark side, he managed to overcome it, and became the point man against Batman alongside Gordon. Gordon's fall and an attack on City Hall left Two face badly injured and mangled, but Dick Grayson managed to save him and inject him with a derivative of Deathstroke's formula. Now, still horrifically scarred on one side of his face, Janus wages war against Batman's regime, making up for his lack of training with gumption, improvisation, and the array of powers at his disposal. Still, every now and then, a hunger and na anger rises in him he has trouble controlling. A great man will subdue it. Harvey must prove he's more than a good man, for right now, that's all he is, and that's not enough...