As Batman faces a multiversal army of his worst selves, DC officially brings a hidden Batman: Arkham Knight villain into official canon. The 2015 game closed out the Arkhamverse game series, and saw Batman battle Scarecrow, Riddler, and a corrupted Jason Todd to save Arkham. At the end of the game, Bruce Wayne fakes his own death, embracing the myth of the Batman as his sole identity. Now, DC's comics are revisiting this Batman and showing what happened next.
https://screenrant.com/batman-zur-en-arrh-arkhamverse-arkham-knight/