Despite helping win the war, defeating Ares and still loving humanity, Diana is still left sobered, emotionally broken, psychologically scarred, and devastated over not having been able to save the Belgian village from Dr. Poison, as well as over her beloved Steve Trevor's self-sacrificing death. Indeed, Diana would later claim that she "would never be the same" ever again after World War I. Moreover, in the years that followed, Diana bore witness to a "century of horrors" (Wars, Fascism, Communism, nuclear weapons' deployment, geopolitical brinkmanship, racism, homophobia, genocides, war crimes, propaganda, and etc.), and due to all of this occurring without Ares being there to spread corruption, Diana almost completely lost faith in humanity, coming to believe that humans "made a world where standing together is impossible". As such, Diana resolved to mostly abandon superheroism for 100 years.
Wonder Woman's origin story relates that she was sculpted from clay by her mother Queen Hippolyta and was given a life to live as an Amazon, along with superhuman powers as gifts by the Greek gods. In recent years, DC changed her background with the retcon that she is the daughter of Zeus and Hippolyta, jointly raised by her mother and her aunts Antiope and Menalippe. The character has changed in depiction over the decades, including briefly losing her powers entirely in the late 1960s; by the 1980s, artist George Perez gave her an atheltic look and emphasized her Amazonian heritage. She possesses an arsenal of advanced technology, including the Lasso of Truth, a pair of indestructible bracelets, a tiara which serves as a projectile, and, in older stories, a range of devices based on Amazon technology.
Diana lifts a tank ready to crush Doctor Poison with it, but hesitates when she thinks about the love and compassion that Steve brought to her life when she realizes that he professed his love for her before leaving to sacrifice himself. Dropping the tank, Diana spares Doctor Poison, telling Ares that he is wrong about humanity. She tells him that while humans are everything Ares says and can be capable of the worst crimes, she's learned that they are equally capable of so much more: unbridled love and compassion. Ares engages Diana in a final fight, but is defeated after she fully embraces her powers as the God Killer and blasts Ares with powerful divine lightning. The soldiers, free from Ares' corruption, stop their fighting, thereby finally ending the war.
When last we left Wonder Woman #49, the battle brewing ever since DC's METAL cracked open the Multiverse seemed to be reaching its climax. With the Dark Gods playing similar roles to the Greek pantheon, but with all-powerful demands, enslaving humanity, Diana and her twin brother Jason were splitting up to oppose them around the globe. Just as they seemed to knock back their leader, King Best, the Dark Gods launch an assault on Jason.