Batman: Gotham Knights #17

MATATOA PART 2 Nightwing tells Batman of his relationship with Oracle in development, while Matatoa escapes Arkham, where Nightwing had taken him. Batman and Nightwing reach it in a construction where Batman refuses to cede its supply of Matatoa giving his own life so that your city can be protected forever. The battle ends and Matatoa disappears, presumably live, Nightwing wonder how this offer was tempting for Batman, who reveals that he knows that Gotham will be protected when he dies, for Nightwing. He also produces a certificate that will make Dick Grayson, the legitimate son and heir Bruce Wayne, making their official family relationship. A MOMENT IN THE LIGHT