Batman: KinghtsEnd (1994) DC Comics

Jean-Paul Valley sees visions of his dead father, who had programmed him at birth to be a deadly weapon. These visions tell Jean-Paul to avenge his father's death, and Jean-Paul searches Gotham for his father's killer. Though the killer, Carlton LeHah, had already been encountered and defeated (in Sword of Azrael), Jean-Paul's conditioning had warped his mind to the extent that he no longer remembered the incident. He eventually comes to believe that Penn Selkirk, a Gotham mobster turned weapons dealer who has taken over the remnants of LeHah's organization, is his father's murderer. Valley now spends his time doggedly pursuing him. Returning to Gotham, Bruce meets with Tim. Even though Jean-Paul disobeyed Bruce's order to refrain from attacking Bane, Bruce is sufficiently impressed with Jean-Paul's results. Bruce decides to retire and allow Jean-Paul to continue as Batman. But when Robin tells Bruce of the circumstances surrounding Abattoir's death, Bruce sneaks into the Batcave and demands that Jean-Paul step down. Jean-Paul refuses and tells Bruce to leave the cave and never come back. To rehabilitate his skills due to his lost reflexes after so long out of action, Bruce asks the famed assassin Lady Shiva to retrain him (Using a mask to conceal his identity and arguing that she will do it for the same reason that she does anything; it might be interesting). Instead, Shiva pits Bruce against several vengeful expert martial artists, having killed their master while wearing a distinctive tengu mask that carries a motif of a bat that she subsequently gives to Batman. Shiva's caveat is that these attacks will continue indefinitely until Bruce Wayne breaks his vow to never kill. Finally, in the midst of an attack by the final martial artist, Bruce feigns using the "Leopard Blow" fatal maneuver Shiva had taught him, leaving his would-be assailant apparently dead. Shiva finally declares him worthy of fighting her at some point in the future, with Bruce only revealing his adversary's survival after her departure. Now back in fighting shape, Bruce returns to the Batcave and resumes his role as Batman. Along with Robin and Nightwing, he tracks Valley down to Selkirk's penthouse. Coincidentally, Catwoman is chasing the same man because he owns a neural enabler which might allow her paraplegic friend to walk again. Selkirk already wants to kill Jean-Paul for destroying a valuable weapons cache in Gotham Harbor. When Bruce tries to find Jean-Paul using the Batmobile, it explodes due to a planted booby-trap. Nightwing fears Bruce dead and takes his vengeance out on Jean-Paul on a party boat. The police arrive in time to prevent Nightwing from committing murder, but Jean-Paul escapes. However, to his shock, Jean-Paul finds Bruce waiting at Wayne Manor; Bruce had managed to escape the Batmobile before Jean-Paul's trap destroyed it, reasoning that he would have done the same thing with a less dangerous trap. The final battle of the "Knightfall" saga takes place between Jean-Paul Valley and Bruce Wayne in the caverns surrounding the Batcave below Wayne Manor: rather than beating Jean-Paul at hand-to-hand combat, Bruce outwits him by escaping into a passage too narrow for Jean-Paul to go through in his armor, thus forcing Jean-Paul to remove most of it. Bruce then opens a hatch to the outside, which covered the very hole he fell into as a child, allowing sunlight to enter the night lenses in Jean-Paul's helmet. After being momentarily blinded, Jean-Paul removes his cowl, sees Bruce standing over him in the original Batman costume and concedes defeat, saying "You are the Batman... You've always been the Batman... and I am nothing..." Bruce comforts Jean-Paul, who leaves to wander the streets of Gotham, homeless and destitute. Bruce decides not to take Jean-Paul to the police because it was his decision to make Jean-Paul the Batman, leading to his subsequent breakdown.