Morgan appears and reveals himself as Ares. He tells Diana that although he has subtly given humans ideas and inspirations, using Ludendorff and Maru as pawns in the process, it is ultimately their decision to resort to violence as they are inherently corrupt. When Diana attempts to kill Ares with the "Godkiller" sword, he destroys it, then reveals to Diana that she herself is the "Godkiller", as the daughter of Zeus and Hippolyta. He fails to persuade Diana to help him destroy mankind in order to restore paradise on Earth. While the two battle, Steve's team destroys Maru's laboratory. Steve hijacks and pilots the bomber carrying the poison to a safe altitude and detonates it, sacrificing himself. Ares attempts to direct Diana's rage and grief at Steve's death by convincing her to kill Maru, but the memories of her experiences with Steve cause her to realize that humans have good within them. She spares Maru and redirects Ares's lightning into him, killing him for good. Later, the team celebrates the end of the war. In the present day, Diana sends an email to Bruce Wayne thanking him for the photographic plate of her and Steve and continues to fight and give on the world's behalf, understanding that only love can truly save the world.
Orion tells Diana that he was sent to earth to fight a threat, and surprised that the possible threat he faces is a mere child. They find out that Zola's baby is being kept with Hermes, who in turn is hiding in Demeter's realm. Going back to the hotel to regroup, they find Zola and Hera missing. Finally finding them in a bar, Diana comes face to face with War, her old master.
On November 3, 2016, Rupert Gregson-Williams was hired to write and compose the film's music. He was joined by Evan Jolly, Tom Howe, Paul Mounsey, and Andrew Kawczynski, who provided additional music. The soundtrack was released on CD, digital, and vinyl the same day as the film. Australian musician Sia sang a song for the film, titled "To Be Human", featuring English musician Labrinth. Written by Florence Welch and Rick Nowels, the track is also featured on the soundtrack. The soundtrack also features samples from Wonder Woman's theme "Is She with You" from the Batman v Superman: Dawn of Justice soundtrack composed by Hans Zimmer and Junkie XL.
Following the events of the Darkseid War, Wonder Woman is told by the dying Myrina Black that on the night of Diana's birth, Hippolyta gave birth to a twin child. This child was revealed to be male, known as Jason, and is said to be incredibly powerful. Wonder Woman makes it her mission to find him. At the same time, she finds the truth behind her origin and history is now cluttered, as she remembers two versions: the pre-Flashpoint one, and the New 52 rendition. She cannot locate Themiscyra or her fellow Amazons and the Lasso of Truth does not work for her anymore.